diff --git a/.coveragerc b/.coveragerc
deleted file mode 100644
index b70b6ec..0000000
--- a/.coveragerc
+++ /dev/null
@@ -1,14 +0,0 @@
-[run]
-branch = True
-source = amazon_paapi
-relative_files = True
-omit = **/sdk/**
-
-[report]
-fail_under = 80
-skip_covered = true
-skip_empty = true
-
-[html]
-directory = coverage_html_report
-skip_covered = false
diff --git a/.env.template b/.env.template
new file mode 100644
index 0000000..79882c3
--- /dev/null
+++ b/.env.template
@@ -0,0 +1,4 @@
+API_KEY=
+API_SECRET=
+AFFILIATE_TAG=
+COUNTRY_CODE=
diff --git a/.flake8 b/.flake8
deleted file mode 100644
index 597ed9e..0000000
--- a/.flake8
+++ /dev/null
@@ -1,4 +0,0 @@
-[flake8]
-max-line-length = 88
-extend-ignore = W503,E203,F401
-exclude = */sdk/*
diff --git a/.githooks/pre-commit b/.githooks/pre-commit
new file mode 100755
index 0000000..2305793
--- /dev/null
+++ b/.githooks/pre-commit
@@ -0,0 +1,12 @@
+#! /bin/bash -e
+
+docker build \
+    --build-arg TAG="3.12" \
+    --build-arg UID="$(id -u)" \
+    --build-arg GID="$(id -g)" \
+    -t python-amazon-paapi .
+
+touch .env
+
+docker run -t --rm -u "$(id -u):$(id -g)" -v "${PWD}:/code" --env-file .env \
+    python-amazon-paapi -c "python -m pre_commit"
diff --git a/.githooks/pre-push b/.githooks/pre-push
deleted file mode 100755
index df00d64..0000000
--- a/.githooks/pre-push
+++ /dev/null
@@ -1,12 +0,0 @@
-#! /bin/bash -e
-
-ROOT_DIR="$(git rev-parse --show-toplevel)"
-source "${ROOT_DIR}/scripts/helpers"
-
-./scripts/check_isort
-./scripts/check_black
-./scripts/check_flake8
-./scripts/check_pylint
-./scripts/run_tests
-
-header "Proceeding with push"
diff --git a/.github/ISSUE_TEMPLATE/---bug-report.md b/.github/ISSUE_TEMPLATE/---bug-report.md
index 5f08e08..a0fa1fc 100644
--- a/.github/ISSUE_TEMPLATE/---bug-report.md
+++ b/.github/ISSUE_TEMPLATE/---bug-report.md
@@ -8,9 +8,9 @@ assignees: ''
 ---
 
 **Steps to reproduce**
-1. 
-2. 
-3. 
+1.
+2.
+3.
 
 **Code example**
 ```python
diff --git a/.github/ISSUE_TEMPLATE/---feature-request.md b/.github/ISSUE_TEMPLATE/---feature-request.md
index f74fa80..924da4f 100644
--- a/.github/ISSUE_TEMPLATE/---feature-request.md
+++ b/.github/ISSUE_TEMPLATE/---feature-request.md
@@ -8,7 +8,7 @@ assignees: ''
 ---
 
 **Is your feature request related to a problem? Please describe.**
-A clear and concise description of what the problem is. 
+A clear and concise description of what the problem is.
 
 **Describe the solution you'd like**
 A clear and concise description of what you want to happen.
diff --git a/.github/workflows/lint-and-test.yml b/.github/workflows/lint-and-test.yml
index 4a32a57..02766ee 100644
--- a/.github/workflows/lint-and-test.yml
+++ b/.github/workflows/lint-and-test.yml
@@ -2,15 +2,18 @@ name: Lint and test
 
 on:
   push:
-  pull_request:
-    types: [opened, reopened]
 
 permissions:
   pull-requests: read
 
-jobs:
+env:
+  API_KEY: ${{ secrets.API_KEY }}
+  API_SECRET: ${{ secrets.API_SECRET }}
+  AFFILIATE_TAG: ${{ secrets.AFFILIATE_TAG }}
+  COUNTRY_CODE: ${{ secrets.COUNTRY_CODE }}
 
-  isort:
+jobs:
+  ruff:
     runs-on: ubuntu-latest
     container:
       image: python:3.12
@@ -18,11 +21,11 @@ jobs:
     - name: Check out code
       uses: actions/checkout@v4
     - name: Install dependencies
-      run: pip install isort
-    - name: Check imports order
-      run: isort -c .
+      run: pip install ruff
+    - name: Check code errors
+      run: ruff check --output-format=github .
 
-  black:
+  mypy:
     runs-on: ubuntu-latest
     container:
       image: python:3.12
@@ -30,35 +33,77 @@ jobs:
     - name: Check out code
       uses: actions/checkout@v4
     - name: Install dependencies
-      run: pip install black
-    - name: Check code format
-      run: black --check --diff --color .
+      run: pip install mypy
+    - name: Check code errors
+      run: mypy amazon_paapi
 
-  flake8:
+  test-py37:
     runs-on: ubuntu-latest
+    needs: [test-py38]
     container:
-      image: python:3.12
+      image: python:3.7
     steps:
     - name: Check out code
       uses: actions/checkout@v4
     - name: Install dependencies
-      run: pip install flake8
-    - name: Check code errors
-      run: flake8 .
+      run: pip install -e . && pip install pytest
+    - name: Run tests
+      run: python -m pytest
 
-  pylint:
+  test-py38:
     runs-on: ubuntu-latest
+    needs: [test-py39]
     container:
-      image: python:3.12
+      image: python:3.8
     steps:
     - name: Check out code
       uses: actions/checkout@v4
     - name: Install dependencies
-      run: pip install pylint
-    - name: Check code errors
-      run: find . -type f -name '*.py' | xargs pylint --disable=missing-docstring --disable=too-few-public-methods
+      run: pip install -e . && pip install pytest
+    - name: Run tests
+      run: python -m pytest
+
+  test-py39:
+    runs-on: ubuntu-latest
+    needs: [test-py310]
+    container:
+      image: python:3.9
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v4
+    - name: Install dependencies
+      run: pip install -e . && pip install pytest
+    - name: Run tests
+      run: python -m pytest
+
+  test-py310:
+    runs-on: ubuntu-latest
+    needs: [test-py311]
+    container:
+      image: python:3.10
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v4
+    - name: Install dependencies
+      run: pip install -e . && pip install pytest
+    - name: Run tests
+      run: python -m pytest
+
+  test-py311:
+    runs-on: ubuntu-latest
+    needs: [test-py312]
+    container:
+      image: python:3.11
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v4
+    - name: Install dependencies
+      run: pip install -e . && pip install pytest
+    - name: Run tests
+      run: python -m pytest
+
 
-  test:
+  test-py312:
     runs-on: ubuntu-latest
     container:
       image: python:3.12
@@ -66,9 +111,9 @@ jobs:
     - name: Check out code
       uses: actions/checkout@v4
     - name: Install dependencies
-      run: pip install coverage certifi six python_dateutil setuptools urllib3
+      run: pip install -e . && pip install coverage pytest
     - name: Run tests
-      run: coverage run -m unittest && coverage xml && coverage report
+      run: coverage run -m pytest && coverage xml && coverage report
     - name: Save code coverage file
       uses: actions/upload-artifact@v4
       with:
@@ -77,7 +122,7 @@ jobs:
 
   sonar:
     runs-on: ubuntu-latest
-    needs: [test]
+    needs: [test-py312]
     steps:
       - name: Check out code
         uses: actions/checkout@v4
diff --git a/.gitignore b/.gitignore
index 388bc29..21fe683 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,11 +1,8 @@
 # Custom folders and files to ignore
 .vscode/
 .DS_Store
-secrets.py
-test.py
 coverage_html_report
 
-
 # Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[cod]
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..5e7e6d0
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,58 @@
+# See https://pre-commit.com for more information
+# See https://pre-commit.com/hooks.html for more hooks
+default_language_version:
+  python: python3.12
+
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.6.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: mixed-line-ending
+      - id: check-yaml
+      - id: check-added-large-files
+      - id: check-ast
+      - id: check-executables-have-shebangs
+      - id: check-shebang-scripts-are-executable
+      - id: check-toml
+      - id: name-tests-test
+
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.6.9
+    hooks:
+      - id: ruff
+        args: [--fix, --exit-non-zero-on-fix]
+      - id: ruff-format
+
+  - repo: https://github.com/lk16/detect-missing-init
+    rev: v0.1.6
+    hooks:
+      - id: detect-missing-init
+        args: ["--create", "--python-folders", "amazon_paapi"]
+
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: 'v1.11.2'
+    hooks:
+      - id: mypy
+        exclude: sdk/
+
+  - repo: local
+    hooks:
+      - id: mypy
+        name: Checking types with mypy
+        language: system
+        entry: "python -m mypy amazon_paapi"
+        pass_filenames: false
+
+      - id: test
+        name: Running tests
+        language: system
+        entry: "python -m coverage run -m pytest -rs"
+        pass_filenames: false
+
+      - id: test
+        name: Checking coverage
+        language: system
+        entry: "python -m coverage report"
+        pass_filenames: false
diff --git a/.shellcheckrc b/.shellcheckrc
deleted file mode 100644
index 1c2cbb5..0000000
--- a/.shellcheckrc
+++ /dev/null
@@ -1,3 +0,0 @@
-# ~/.shellcheckrc
-
-disable=SC1091
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..5b1ed84
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,29 @@
+ARG TAG="3.12"
+
+FROM python:${TAG}
+
+ARG UID="1000"
+ARG GID="1000"
+
+ENV PRE_COMMIT_HOME="/code/.cache/pre-commit"
+ENV PRE_COMMIT_COLOR="always"
+
+RUN groupadd --gid ${GID} user \
+    && useradd --uid ${UID} --gid user --shell /bin/bash --create-home user
+
+USER user
+
+WORKDIR /code
+
+RUN pip install --no-cache-dir \
+    coverage \
+    mypy \
+    pre-commit \
+    pytest \
+    ruff
+
+COPY setup.py setup.py
+COPY README.md README.md
+RUN pip install --no-cache-dir -e .
+
+ENTRYPOINT [ "bash" ]
diff --git a/LICENSE b/LICENSE
index 67111a9..3ac2caa 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2020 Sergio Abad
+Copyright (c) 2024 Sergio Abad
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..609517a
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,34 @@
+export UID:=$(shell id -u)
+export GID:=$(shell id -g)
+
+export PYTHON_TAGS = 3.7 3.8 3.9 3.10 3.11 3.12
+
+setup:
+	@git config --unset-all core.hooksPath || true
+	@git config --local core.hooksPath .githooks
+
+build:
+	@docker build --build-arg TAG="3.12" --build-arg UID="${UID}" --build-arg GID="${GID}" -t python-amazon-paapi .
+
+coverage: build
+	@touch .env
+	@docker run -t --rm -u "${UID}:${GID}" -v "${PWD}:/code" --env-file .env python-amazon-paapi -c \
+		"python -m coverage run -m pytest -rs && python -m coverage xml && python -m coverage report"
+
+test: build
+	@touch .env
+	@docker run -t --rm -u "${UID}:${GID}" -v "${PWD}:/code" --env-file .env python-amazon-paapi -c "python -m pytest -rs"
+
+test-all-python-tags:
+	@touch .env
+	@for tag in $$PYTHON_TAGS; do \
+		docker build --build-arg TAG="$$tag" --build-arg UID="${UID}" --build-arg GID="${GID}" -t python-amazon-paapi .; \
+		docker run -t --rm -u "${UID}:${GID}" -v "${PWD}:/code" python-amazon-paapi -c "python -m pytest -rs"; \
+	done
+
+lint: build
+	@touch .env
+	@docker run --rm -t -u "${UID}:${GID}" -v "${PWD}:/code" --env-file .env python-amazon-paapi -c "python -m pre_commit run -a"
+
+pre-commit:
+	@./.githooks/pre-commit
diff --git a/README.md b/README.md
index b7055e4..11fb619 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ API](https://webservices.amazon.com/paapi5/documentation/quick-start/using-sdk.h
 This module allows interacting with Amazon using the official API in an easier way.
 
 [![PyPI](https://img.shields.io/pypi/v/python-amazon-paapi?color=%231182C2&label=PyPI)](https://pypi.org/project/python-amazon-paapi/)
-[![Python](https://img.shields.io/badge/Python->3.6-%23FFD140)](https://www.python.org/)
+[![Python](https://img.shields.io/badge/Python->3.7-%23FFD140)](https://www.python.org/)
 [![License](https://img.shields.io/badge/License-MIT-%23e83633)](https://github.com/sergioteula/python-amazon-paapi/blob/master/LICENSE)
 [![Amazon API](https://img.shields.io/badge/Amazon%20API-5.0-%23FD9B15)](https://webservices.amazon.com/paapi5/documentation/)
 [![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=sergioteula_python-amazon-paapi&metric=alert_status)](https://sonarcloud.io/summary/new_code?id=sergioteula_python-amazon-paapi)
diff --git a/amazon_paapi/__init__.py b/amazon_paapi/__init__.py
index 61887fa..d46c2d6 100644
--- a/amazon_paapi/__init__.py
+++ b/amazon_paapi/__init__.py
@@ -1,4 +1,4 @@
-"""Amazon Product Advertising API wrapper for Python"""
+"""Amazon Product Advertising API wrapper for Python."""
 
 __author__ = "Sergio Abad"
 
diff --git a/amazon_paapi/api.py b/amazon_paapi/api.py
index a6e54d1..181ca73 100644
--- a/amazon_paapi/api.py
+++ b/amazon_paapi/api.py
@@ -1,10 +1,10 @@
-"""Amazon Product Advertising API wrapper for Python
+"""Amazon Product Advertising API wrapper for Python.
 
 A simple Python wrapper for the last version of the Amazon Product Advertising API.
 """
 
 import time
-from typing import List, Union
+from typing import List, Optional, Union
 
 from . import models
 from .errors import InvalidArgument
@@ -27,6 +27,7 @@ class AmazonApi:
 
     Raises:
         ``InvalidArgumentException``
+
     """
 
     def __init__(
@@ -36,8 +37,8 @@ def __init__(
         tag: str,
         country: models.Country,
         throttling: float = 1,
-        **kwargs
-    ):
+        **kwargs,
+    ) -> None:
         self._key = key
         self._secret = secret
         self._last_query_time = time.time() - throttling
@@ -50,7 +51,8 @@ def __init__(
             self.region = models.regions.REGIONS[country]
             self.marketplace = "www.amazon." + models.regions.DOMAINS[country]
         except KeyError as error:
-            raise InvalidArgument("Country code is not correct") from error
+            msg = "Country code is not correct"
+            raise InvalidArgument(msg) from error
 
         self.api = DefaultApi(key, secret, self._host, self.region)
 
@@ -59,10 +61,10 @@ def get_items(
         items: Union[str, List[str]],
         condition: models.Condition = None,
         merchant: models.Merchant = None,
-        currency_of_preference: str = None,
-        languages_of_preference: List[str] = None,
+        currency_of_preference: Optional[str] = None,
+        languages_of_preference: Optional[List[str]] = None,
         include_unavailable: bool = False,
-        **kwargs
+        **kwargs,
     ) -> List[models.Item]:
         """Get items information from Amazon.
 
@@ -91,8 +93,8 @@ def get_items(
             ``MalformedRequestException``
             ``ApiRequestException``
             ``ItemsNotFoundException``
-        """
 
+        """
         kwargs.update(
             {
                 "condition": condition,
@@ -115,28 +117,28 @@ def get_items(
 
     def search_items(
         self,  # NOSONAR
-        item_count: int = None,
-        item_page: int = None,
-        actor: str = None,
-        artist: str = None,
-        author: str = None,
-        brand: str = None,
-        keywords: str = None,
-        title: str = None,
+        item_count: Optional[int] = None,
+        item_page: Optional[int] = None,
+        actor: Optional[str] = None,
+        artist: Optional[str] = None,
+        author: Optional[str] = None,
+        brand: Optional[str] = None,
+        keywords: Optional[str] = None,
+        title: Optional[str] = None,
         availability: models.Availability = None,
-        browse_node_id: str = None,
+        browse_node_id: Optional[str] = None,
         condition: models.Condition = None,
-        currency_of_preference: str = None,
-        delivery_flags: List[str] = None,
-        languages_of_preference: List[str] = None,
+        currency_of_preference: Optional[str] = None,
+        delivery_flags: Optional[List[str]] = None,
+        languages_of_preference: Optional[List[str]] = None,
         merchant: models.Merchant = None,
-        max_price: int = None,
-        min_price: int = None,
-        min_saving_percent: int = None,
-        min_reviews_rating: int = None,
-        search_index: str = None,
+        max_price: Optional[int] = None,
+        min_price: Optional[int] = None,
+        min_saving_percent: Optional[int] = None,
+        min_reviews_rating: Optional[int] = None,
+        search_index: Optional[str] = None,
         sort_by: models.SortBy = None,
-        **kwargs
+        **kwargs,
     ) -> models.SearchResult:
         """Searches for items on Amazon based on a search query. At least one of the
         following parameters should be specified: ``keywords``, ``actor``, ``artist``,
@@ -195,8 +197,8 @@ def search_items(
             ``MalformedRequestException``
             ``ApiRequestException``
             ``ItemsNotFoundException``
-        """
 
+        """
         kwargs.update(
             {
                 "item_count": item_count,
@@ -231,13 +233,13 @@ def search_items(
     def get_variations(
         self,
         asin: str,
-        variation_count: int = None,
-        variation_page: int = None,
+        variation_count: Optional[int] = None,
+        variation_page: Optional[int] = None,
         condition: models.Condition = None,
-        currency_of_preference: str = None,
-        languages_of_preference: List[str] = None,
+        currency_of_preference: Optional[str] = None,
+        languages_of_preference: Optional[List[str]] = None,
         merchant: models.Merchant = None,
-        **kwargs
+        **kwargs,
     ) -> models.VariationsResult:
         """Returns a set of items that are the same product, but differ according to a
         consistent theme, for example size and color. A variation is a child ASIN.
@@ -268,8 +270,8 @@ def get_variations(
             ``MalformedRequestException``
             ``ApiRequestException``
             ``ItemsNotFoundException``
-        """
 
+        """
         asin = arguments.get_items_ids(asin)[0]
 
         kwargs.update(
@@ -292,8 +294,8 @@ def get_variations(
     def get_browse_nodes(
         self,
         browse_node_ids: List[str],
-        languages_of_preference: List[str] = None,
-        **kwargs
+        languages_of_preference: Optional[List[str]] = None,
+        **kwargs,
     ) -> List[models.BrowseNode]:
         """Returns the specified browse node's information like name, children and
         ancestors.
@@ -314,8 +316,8 @@ def get_browse_nodes(
             ``MalformedRequestException``
             ``ApiRequestException``
             ``ItemsNotFoundException``
-        """
 
+        """
         kwargs.update(
             {
                 "browse_node_ids": browse_node_ids,
@@ -328,7 +330,7 @@ def get_browse_nodes(
         self._throttle()
         return requests.get_browse_nodes_response(self, request)
 
-    def _throttle(self):
+    def _throttle(self) -> None:
         wait_time = self.throttling - (time.time() - self._last_query_time)
         if wait_time > 0:
             time.sleep(wait_time)
diff --git a/amazon_paapi/errors/exceptions.py b/amazon_paapi/errors/exceptions.py
index 707d4d3..b0eba7c 100644
--- a/amazon_paapi/errors/exceptions.py
+++ b/amazon_paapi/errors/exceptions.py
@@ -1,10 +1,10 @@
-"""Custom exceptions module"""
+"""Custom exceptions module."""
 
 
 class AmazonError(Exception):
     """Common base class for all Amazon API exceptions."""
 
-    def __init__(self, reason: str):
+    def __init__(self, reason: str) -> None:
         super().__init__()
         self.reason = reason
 
diff --git a/amazon_paapi/helpers/arguments.py b/amazon_paapi/helpers/arguments.py
index 29ef67a..269a125 100644
--- a/amazon_paapi/helpers/arguments.py
+++ b/amazon_paapi/helpers/arguments.py
@@ -1,17 +1,15 @@
 """Module with helper functions for managing arguments."""
 
-
 from typing import List, Union
 
-from ..errors import InvalidArgument
-from ..tools import get_asin
+from amazon_paapi.errors import InvalidArgument
+from amazon_paapi.tools import get_asin
 
 
 def get_items_ids(items: Union[str, List[str]]) -> List[str]:
     if not isinstance(items, str) and not isinstance(items, List):
-        raise InvalidArgument(
-            "Invalid items argument, it should be a string or List of strings"
-        )
+        msg = "Invalid items argument, it should be a string or List of strings"
+        raise InvalidArgument(msg)
 
     if isinstance(items, str):
         items_ids = items.split(",")
@@ -23,12 +21,12 @@ def get_items_ids(items: Union[str, List[str]]) -> List[str]:
     return items_ids
 
 
-def check_search_args(**kwargs):
+def check_search_args(**kwargs) -> None:
     check_search_mandatory_args(**kwargs)
     check_search_pagination_args(**kwargs)
 
 
-def check_search_mandatory_args(**kwargs):
+def check_search_mandatory_args(**kwargs) -> None:
     mandatory_args = [
         kwargs.get("keywords"),
         kwargs.get("actor"),
@@ -47,7 +45,7 @@ def check_search_mandatory_args(**kwargs):
         raise InvalidArgument(error_message)
 
 
-def check_search_pagination_args(**kwargs):
+def check_search_pagination_args(**kwargs) -> None:
     error_message = "Args item_count and item_page should be integers between 1 and 10."
     pagination_args = [kwargs.get("item_count"), kwargs.get("item_page")]
     pagination_args = [arg for arg in pagination_args if arg]
@@ -59,7 +57,7 @@ def check_search_pagination_args(**kwargs):
         raise InvalidArgument(error_message)
 
 
-def check_variations_args(**kwargs):
+def check_variations_args(**kwargs) -> None:
     error_message = (
         "Args variation_count and variation_page should be integers between 1 and 10."
     )
@@ -73,7 +71,7 @@ def check_variations_args(**kwargs):
         raise InvalidArgument(error_message)
 
 
-def check_browse_nodes_args(**kwargs):
+def check_browse_nodes_args(**kwargs) -> None:
     if not isinstance(kwargs.get("browse_node_ids"), List):
         error_message = "Argument browse_node_ids should be a List of strings."
         raise InvalidArgument(error_message)
diff --git a/amazon_paapi/helpers/generators.py b/amazon_paapi/helpers/generators.py
index f0d6537..ccb56fe 100644
--- a/amazon_paapi/helpers/generators.py
+++ b/amazon_paapi/helpers/generators.py
@@ -1,6 +1,5 @@
 """Module with helper functions for making generators."""
 
-
 from typing import Generator, List
 
 
diff --git a/amazon_paapi/helpers/items.py b/amazon_paapi/helpers/items.py
index 40b139f..dcb15e0 100644
--- a/amazon_paapi/helpers/items.py
+++ b/amazon_paapi/helpers/items.py
@@ -1,8 +1,8 @@
-"""Module to manage items"""
+"""Module to manage items."""
 
 from typing import List
 
-from .. import models
+from amazon_paapi import models
 
 
 def sort_items(
diff --git a/amazon_paapi/helpers/requests.py b/amazon_paapi/helpers/requests.py
index fa6880a..52b8db5 100644
--- a/amazon_paapi/helpers/requests.py
+++ b/amazon_paapi/helpers/requests.py
@@ -1,10 +1,9 @@
 """Module with helper functions for creating requests."""
 
-
 import inspect
 from typing import List
 
-from ..errors import (
+from amazon_paapi.errors import (
     AssociateValidationError,
     InvalidArgument,
     ItemsNotFound,
@@ -12,20 +11,20 @@
     RequestError,
     TooManyRequests,
 )
-from ..models.browse_nodes_result import BrowseNode
-from ..models.item_result import Item
-from ..models.search_result import SearchResult
-from ..models.variations_result import VariationsResult
-from ..sdk.models.get_browse_nodes_request import GetBrowseNodesRequest
-from ..sdk.models.get_browse_nodes_resource import GetBrowseNodesResource
-from ..sdk.models.get_items_request import GetItemsRequest
-from ..sdk.models.get_items_resource import GetItemsResource
-from ..sdk.models.get_variations_request import GetVariationsRequest
-from ..sdk.models.get_variations_resource import GetVariationsResource
-from ..sdk.models.partner_type import PartnerType
-from ..sdk.models.search_items_request import SearchItemsRequest
-from ..sdk.models.search_items_resource import SearchItemsResource
-from ..sdk.rest import ApiException
+from amazon_paapi.models.browse_nodes_result import BrowseNode
+from amazon_paapi.models.item_result import Item
+from amazon_paapi.models.search_result import SearchResult
+from amazon_paapi.models.variations_result import VariationsResult
+from amazon_paapi.sdk.models.get_browse_nodes_request import GetBrowseNodesRequest
+from amazon_paapi.sdk.models.get_browse_nodes_resource import GetBrowseNodesResource
+from amazon_paapi.sdk.models.get_items_request import GetItemsRequest
+from amazon_paapi.sdk.models.get_items_resource import GetItemsResource
+from amazon_paapi.sdk.models.get_variations_request import GetVariationsRequest
+from amazon_paapi.sdk.models.get_variations_resource import GetVariationsResource
+from amazon_paapi.sdk.models.partner_type import PartnerType
+from amazon_paapi.sdk.models.search_items_request import SearchItemsRequest
+from amazon_paapi.sdk.models.search_items_resource import SearchItemsResource
+from amazon_paapi.sdk.rest import ApiException
 
 
 def get_items_request(amazon_api, asin_chunk: List[str], **kwargs) -> GetItemsRequest:
@@ -39,9 +38,8 @@ def get_items_request(amazon_api, asin_chunk: List[str], **kwargs) -> GetItemsRe
             **kwargs,
         )
     except TypeError as exc:
-        raise MalformedRequest(
-            f"Parameters for get_items request are not correct: {exc}"
-        ) from exc
+        msg = f"Parameters for get_items request are not correct: {exc}"
+        raise MalformedRequest(msg) from exc
 
 
 def get_items_response(amazon_api, request: GetItemsRequest) -> List[Item]:
@@ -51,7 +49,8 @@ def get_items_response(amazon_api, request: GetItemsRequest) -> List[Item]:
         _manage_response_exceptions(exc)
 
     if response.items_result is None:
-        raise ItemsNotFound("No items have been found")
+        msg = "No items have been found"
+        raise ItemsNotFound(msg)
 
     return response.items_result.items
 
@@ -66,9 +65,8 @@ def get_search_items_request(amazon_api, **kwargs) -> SearchItemsRequest:
             **kwargs,
         )
     except TypeError as exc:
-        raise MalformedRequest(
-            f"Parameters for search_items request are not correct: {exc}"
-        ) from exc
+        msg = f"Parameters for search_items request are not correct: {exc}"
+        raise MalformedRequest(msg) from exc
 
 
 def get_search_items_response(amazon_api, request: SearchItemsRequest) -> SearchResult:
@@ -78,7 +76,8 @@ def get_search_items_response(amazon_api, request: SearchItemsRequest) -> Search
         _manage_response_exceptions(exc)
 
     if response.search_result is None:
-        raise ItemsNotFound("No items have been found")
+        msg = "No items have been found"
+        raise ItemsNotFound(msg)
 
     return response.search_result
 
@@ -93,9 +92,8 @@ def get_variations_request(amazon_api, **kwargs) -> GetVariationsRequest:
             **kwargs,
         )
     except TypeError as exc:
-        raise MalformedRequest(
-            f"Parameters for get_variations request are not correct: {exc}"
-        ) from exc
+        msg = f"Parameters for get_variations request are not correct: {exc}"
+        raise MalformedRequest(msg) from exc
 
 
 def get_variations_response(
@@ -107,7 +105,8 @@ def get_variations_response(
         _manage_response_exceptions(exc)
 
     if response.variations_result is None:
-        raise ItemsNotFound("No variation items have been found")
+        msg = "No variation items have been found"
+        raise ItemsNotFound(msg)
 
     return response.variations_result
 
@@ -122,9 +121,8 @@ def get_browse_nodes_request(amazon_api, **kwargs) -> GetBrowseNodesRequest:
             **kwargs,
         )
     except TypeError as exc:
-        raise MalformedRequest(
-            f"Parameters for get_browse_nodes request are not correct: {exc}"
-        ) from exc
+        msg = f"Parameters for get_browse_nodes request are not correct: {exc}"
+        raise MalformedRequest(msg) from exc
 
 
 def get_browse_nodes_response(
@@ -136,17 +134,15 @@ def get_browse_nodes_response(
         _manage_response_exceptions(exc)
 
     if response.browse_nodes_result is None:
-        raise ItemsNotFound("No browse nodes have been found")
+        msg = "No browse nodes have been found"
+        raise ItemsNotFound(msg)
 
     return response.browse_nodes_result.browse_nodes
 
 
 def _get_request_resources(resources) -> List[str]:
     resources = inspect.getmembers(resources, lambda a: not inspect.isroutine(a))
-    resources = [
-        x[-1] for x in resources if isinstance(x[-1], str) and x[0][0:2] != "__"
-    ]
-    return resources
+    return [x[-1] for x in resources if isinstance(x[-1], str) and x[0][0:2] != "__"]
 
 
 def _manage_response_exceptions(error) -> None:
@@ -154,22 +150,22 @@ def _manage_response_exceptions(error) -> None:
     error_body = getattr(error, "body", "") or ""
 
     if error_status == 429:
-        raise TooManyRequests(
+        msg = (
             "Requests limit reached, try increasing throttling or wait before"
             " trying again"
         )
+        raise TooManyRequests(msg)
 
     if "InvalidParameterValue" in error_body:
-        raise InvalidArgument(
-            "The value provided in the request for atleast one parameter is invalid."
-        )
+        msg = "The value provided in the request for atleast one parameter is invalid."
+        raise InvalidArgument(msg)
 
     if "InvalidPartnerTag" in error_body:
-        raise InvalidArgument("The partner tag is invalid or not present.")
+        msg = "The partner tag is invalid or not present."
+        raise InvalidArgument(msg)
 
     if "InvalidAssociate" in error_body:
-        raise AssociateValidationError(
-            "Used credentials are not valid for the selected country."
-        )
+        msg = "Used credentials are not valid for the selected country."
+        raise AssociateValidationError(msg)
 
     raise RequestError("Request failed: " + str(error.reason))
diff --git a/amazon_paapi/models/__init__.py b/amazon_paapi/models/__init__.py
index 415cda1..b4b8308 100644
--- a/amazon_paapi/models/__init__.py
+++ b/amazon_paapi/models/__init__.py
@@ -1,4 +1,5 @@
-from ..sdk.models import Availability, Condition, Merchant, SortBy
+from amazon_paapi.sdk.models import Availability, Condition, Merchant, SortBy
+
 from .browse_nodes_result import BrowseNode
 from .item_result import Item
 from .regions import Country
diff --git a/amazon_paapi/models/browse_nodes_result.py b/amazon_paapi/models/browse_nodes_result.py
index 14dcf2f..79e53b3 100644
--- a/amazon_paapi/models/browse_nodes_result.py
+++ b/amazon_paapi/models/browse_nodes_result.py
@@ -1,6 +1,6 @@
 from typing import List
 
-from ..sdk import models as sdk_models
+from amazon_paapi.sdk import models as sdk_models
 
 
 class BrowseNodeChild(sdk_models.BrowseNodeChild):
diff --git a/amazon_paapi/models/item_result.py b/amazon_paapi/models/item_result.py
index 616a1d6..8c969cb 100644
--- a/amazon_paapi/models/item_result.py
+++ b/amazon_paapi/models/item_result.py
@@ -1,6 +1,6 @@
 from typing import List, Optional
 
-from ..sdk import models as sdk_models
+from amazon_paapi.sdk import models as sdk_models
 
 
 class ApiLabelLocale:
diff --git a/amazon_paapi/models/search_result.py b/amazon_paapi/models/search_result.py
index 7e27143..a715acc 100644
--- a/amazon_paapi/models/search_result.py
+++ b/amazon_paapi/models/search_result.py
@@ -1,6 +1,7 @@
 from typing import List
 
-from ..sdk import models as sdk_models
+from amazon_paapi.sdk import models as sdk_models
+
 from .item_result import Item
 
 
diff --git a/amazon_paapi/models/variations_result.py b/amazon_paapi/models/variations_result.py
index a15db36..1189e5d 100644
--- a/amazon_paapi/models/variations_result.py
+++ b/amazon_paapi/models/variations_result.py
@@ -1,6 +1,7 @@
 from typing import List
 
-from ..sdk import models as sdk_models
+from amazon_paapi.sdk import models as sdk_models
+
 from .item_result import Item
 
 
diff --git a/amazon_paapi/sdk/NOTICE.txt b/amazon_paapi/sdk/NOTICE.txt
index 526e5d9..93040d3 100644
--- a/amazon_paapi/sdk/NOTICE.txt
+++ b/amazon_paapi/sdk/NOTICE.txt
@@ -1,2 +1,2 @@
 Product Advertising API 5.0 SDK for Python
-Copyright 2019-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved. 
\ No newline at end of file
+Copyright 2019-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
diff --git a/amazon_paapi/tools/asin.py b/amazon_paapi/tools/asin.py
index 46a585c..1f08e8d 100644
--- a/amazon_paapi/tools/asin.py
+++ b/amazon_paapi/tools/asin.py
@@ -2,7 +2,7 @@
 
 import re
 
-from ..errors import AsinNotFound
+from amazon_paapi.errors import AsinNotFound
 
 
 def get_asin(text: str) -> str:
diff --git a/examples/example.py b/examples/example.py
deleted file mode 100644
index dde03ad..0000000
--- a/examples/example.py
+++ /dev/null
@@ -1,35 +0,0 @@
-import secrets
-
-from amazon_paapi import AmazonApi
-
-# pylint: disable=no-member
-amazon = AmazonApi(
-    secrets.KEY, secrets.SECRET, secrets.TAG, secrets.COUNTRY, throttling=2
-)
-
-
-print("\nGet items")
-print("=========================================================")
-product = amazon.get_items("B01N5IB20Q")
-print(product[0].item_info.title.display_value)
-
-
-print("Search items")
-print("=========================================================")
-items = amazon.search_items(keywords="nintendo", item_count=3)
-for item in items.items:
-    print(item.item_info.title.display_value)
-
-
-print("\nGet variations")
-print("=========================================================")
-items = amazon.get_variations("B08F63PPNV", variation_count=3)
-for item in items.items:
-    print(item.item_info.title.display_value)
-
-
-print("\nGet nodes")
-print("=========================================================")
-items = amazon.get_browse_nodes(["667049031"])  # Only available in spanish marketplace
-for item in items:
-    print(item.display_name)
diff --git a/pyproject.toml b/pyproject.toml
index a833497..3a9eee8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,24 +1,79 @@
-[tool.black]
-preview = true
-exclude = ".*/sdk/.*"
-
-[tool.isort]
-profile = "black"
-skip_glob = "*/sdk/*"
-
-[tool.pylint]
-    [tool.pylint.master]
-        ignore = ["test.py"]
-        ignore-paths = [".*/sdk/", ".*docs/"]
-    [tool.pylint.message_control]
-        disable = [
-            "no-self-use",
-            "protected-access",
-            "too-many-arguments",
-            "too-many-instance-attributes",
-            "too-many-locals",
-            "too-many-public-methods",
-        ]
-        ignored-argument-names = "args|kwargs"
-    [tool.pylint.similarities]
-        ignore-imports = true
+[tool.ruff]
+target-version = "py37"
+cache-dir = ".cache/ruff"
+unsafe-fixes = true
+
+[tool.ruff.lint]
+select = ["ALL"]
+ignore = [
+    "ANN003",
+    "D104",
+    "D100",
+    "D203",
+    "D213",
+    "COM812",
+    "ISC001",
+]
+exclude = [
+    "amazon_paapi/sdk/*",
+    "docs/*",
+]
+
+[tool.ruff.lint.per-file-ignores]
+"tests/*" = [
+    "ANN201",
+    "ANN206",
+    "D101",
+    "D102",
+    "D103",
+    "D107",
+    "PT009",
+    "PT027",
+    "SLF001",
+]
+
+[tool.ruff.format]
+exclude = [
+    "amazon_paapi/sdk/*",
+    "docs/*",
+    ".github",
+]
+
+[tool.mypy]
+python_version = "3.7"
+ignore_missing_imports = true
+no_implicit_optional = true
+strict_equality = true
+warn_redundant_casts = true
+warn_return_any = true
+warn_unreachable = true
+warn_unused_configs = true
+warn_unused_ignores = true
+cache_dir = '.cache/mypy'
+exclude = ["amazon_paapi/sdk/*"]
+
+[[tool.mypy.overrides]]
+module = [
+  "amazon_paapi/sdk/*",
+]
+follow_imports = "skip"
+
+[tool.coverage.run]
+branch = true
+relative_files = true
+source = ["amazon_paapi"]
+omit = ["amazon_paapi/sdk/*"]
+
+[tool.coverage.report]
+precision = 2
+skip_covered = true
+skip_empty = true
+fail_under = 95
+
+[tool.coverage.html]
+directory = "coverage_html_report"
+skip_covered = false
+
+[tool.pytest.ini_options]
+testpaths = "tests"
+cache_dir = ".cache/pytest"
diff --git a/scripts/check_black b/scripts/check_black
deleted file mode 100755
index bdebf44..0000000
--- a/scripts/check_black
+++ /dev/null
@@ -1,23 +0,0 @@
-#! /bin/bash
-
-ROOT_DIR="$(git rev-parse --show-toplevel)"
-source "${ROOT_DIR}/scripts/helpers"
-
-header "Checking code format with black"
-
-if [ -n "$(check_if_installed docker)" ]; then
-    docker run -v "${PWD}:/code" sergioteula/pytools black --check --diff --color .
-elif [ -n "$(check_if_installed black)" ]; then
-    black --check --diff --color .
-else
-    error "black is not installed"
-    exit 1
-fi
-
-EXIT_CODE="$?"
-if [ "$EXIT_CODE" = "0" ]; then
-    success "Code is correctly formatted"
-else
-    error "Code should be formatted using black"
-    exit 1
-fi
diff --git a/scripts/check_flake8 b/scripts/check_flake8
deleted file mode 100755
index 1a117a1..0000000
--- a/scripts/check_flake8
+++ /dev/null
@@ -1,23 +0,0 @@
-#! /bin/bash
-
-ROOT_DIR="$(git rev-parse --show-toplevel)"
-source "${ROOT_DIR}/scripts/helpers"
-
-header "Checking code errors with flake8"
-
-if [ -n "$(check_if_installed docker)" ]; then
-    docker run -v "${PWD}:/code" sergioteula/pytools flake8 --color always .
-elif [ -n "$(check_if_installed flake8)" ]; then
-    flake8 --color always .
-else
-    error "flake8 is not installed"
-    exit 1
-fi
-
-EXIT_CODE="$?"
-if [ "$EXIT_CODE" = "0" ]; then
-    success "Code analysis with flake8 is correct"
-else
-    error "There are errors detected by flake8"
-    exit 1
-fi
diff --git a/scripts/check_isort b/scripts/check_isort
deleted file mode 100755
index 046205e..0000000
--- a/scripts/check_isort
+++ /dev/null
@@ -1,23 +0,0 @@
-#! /bin/bash
-
-ROOT_DIR="$(git rev-parse --show-toplevel)"
-source "${ROOT_DIR}/scripts/helpers"
-
-header "Checking imports order with isort"
-
-if [ -n "$(check_if_installed docker)" ]; then
-    docker run -v "${PWD}:/code" sergioteula/pytools isort -c --color .
-elif [ -n "$(check_if_installed isort)" ]; then
-    isort -c --color .
-else
-    error "isort is not installed"
-    exit 1
-fi
-
-EXIT_CODE="$?"
-if [ "$EXIT_CODE" = "0" ]; then
-    success "Imports are correctly ordered"
-else
-    error "Imports order is not correct"
-    exit 1
-fi
diff --git a/scripts/check_pylint b/scripts/check_pylint
deleted file mode 100755
index 8cdb438..0000000
--- a/scripts/check_pylint
+++ /dev/null
@@ -1,23 +0,0 @@
-#! /bin/bash
-
-ROOT_DIR="$(git rev-parse --show-toplevel)"
-source "${ROOT_DIR}/scripts/helpers"
-
-header "Checking code errors with pylint"
-
-if [ -n "$(check_if_installed docker)" ]; then
-    docker run -v "${PWD}:/code" sergioteula/pytools find . -type f -name '*.py' | xargs pylint --disable=missing-docstring --disable=too-few-public-methods
-elif [ -n "$(check_if_installed pylint)" ]; then
-    find . -type f -name '*.py' | xargs pylint --disable=missing-docstring --disable=too-few-public-methods
-else
-    error "pylint is not installed"
-    exit 1
-fi
-
-EXIT_CODE="$?"
-if [ "$EXIT_CODE" = "0" ]; then
-    success "Code analysis with pylint is correct"
-else
-    error "There are errors detected by pylint"
-    exit 1
-fi
diff --git a/scripts/helpers b/scripts/helpers
deleted file mode 100755
index 6c44dde..0000000
--- a/scripts/helpers
+++ /dev/null
@@ -1,30 +0,0 @@
-#! /bin/bash -e
-
-BLUE="\033[0;34m"
-GREEN="\033[0;32m"
-RED="\033[0;31m"
-YELLOW="\033[0;33m"
-NC="\033[0m"
-LINE="----------------------------------------------------------------------"
-
-check_if_installed() {
-    if [ -x "$(command -v "${1}")" ]; then
-        echo "${1} is installed"
-    fi
-}
-
-header(){
-    echo -e "\n${BLUE}${*}\n${BLUE}${LINE}${NC}"
-}
-
-warning(){
-    echo -e "${YELLOW}WARNING: ${*}${NC}"
-}
-
-error(){
-    echo -e "${RED}ERROR: ${*}${NC}"
-}
-
-success(){
-    echo -e "${GREEN}${*}${NC}"
-}
diff --git a/scripts/run_tests b/scripts/run_tests
deleted file mode 100755
index 23eb2fd..0000000
--- a/scripts/run_tests
+++ /dev/null
@@ -1,24 +0,0 @@
-#! /bin/bash
-
-ROOT_DIR="$(git rev-parse --show-toplevel)"
-source "${ROOT_DIR}/scripts/helpers"
-
-header "Running tests"
-
-if [ -n "$(check_if_installed docker)" ]; then
-    docker run -v "${PWD}:/code" -u "$(id -u):$(id -g)" sergioteula/pytools bash -c \
-        "coverage run -m unittest && coverage xml && coverage html && echo && coverage report"
-elif [ -n "$(check_if_installed coverage)" ]; then
-    coverage run -m unittest && coverage xml && coverage html && echo && coverage report
-else
-    error "coverage is not installed"
-    exit 1
-fi
-
-EXIT_CODE="$?"
-if [ "$EXIT_CODE" = "0" ]; then
-    success "Tests passed"
-else
-    error "Tests failed"
-    exit 1
-fi
diff --git a/setup.py b/setup.py
index f570722..8d02080 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,6 @@
 import setuptools
 
-with open("README.md", "r", encoding="utf8") as fh:
+with open("README.md", encoding="utf8") as fh:
     long_description = fh.read()
 
 setuptools.setup(
@@ -20,5 +20,5 @@
         "License :: OSI Approved :: MIT License",
         "Operating System :: OS Independent",
     ],
-    python_requires=">=3.6",
+    python_requires=">=3.7",
 )
diff --git a/sonar-project.properties b/sonar-project.properties
index fade800..0b516c0 100644
--- a/sonar-project.properties
+++ b/sonar-project.properties
@@ -7,4 +7,4 @@ sonar.tests=tests
 sonar.python.coverage.reportPaths=coverage.xml
 
 sonar.qualitygate.wait=true
-sonar.python.version=3.6,3.7,3.8,3.9,3.10,3.11,3.12
+sonar.python.version=3.7,3.8,3.9,3.10,3.11,3.12
diff --git a/tests/integration_test.py b/tests/integration_test.py
new file mode 100644
index 0000000..58dcfb3
--- /dev/null
+++ b/tests/integration_test.py
@@ -0,0 +1,36 @@
+from __future__ import annotations
+
+import os
+from unittest import TestCase, skipUnless
+
+from amazon_paapi.api import AmazonApi
+
+
+def get_api_credentials() -> tuple[str]:
+    api_key = os.environ.get("API_KEY")
+    api_secret = os.environ.get("API_SECRET")
+    affiliate_tag = os.environ.get("AFFILIATE_TAG")
+    country_code = os.environ.get("COUNTRY_CODE")
+
+    return api_key, api_secret, affiliate_tag, country_code
+
+
+@skipUnless(all(get_api_credentials()), "Needs Amazon API credentials")
+class IntegrationTest(TestCase):
+    @classmethod
+    def setUpClass(cls):
+        api_key, api_secret, affiliate_tag, country_code = get_api_credentials()
+        cls.api = AmazonApi(api_key, api_secret, affiliate_tag, country_code)
+        cls.affiliate_tag = affiliate_tag
+
+    def test_search_items_and_get_information_for_the_first_one(self):
+        search_result = self.api.search_items(keywords="zapatillas")
+        searched_item = search_result.items[0]
+
+        self.assertEqual(10, len(search_result.items))
+        self.assertIn(self.affiliate_tag, searched_item.detail_page_url)
+
+        get_results = self.api.get_items(searched_item.asin)
+
+        self.assertEqual(1, len(get_results))
+        self.assertIn(self.affiliate_tag, get_results[0].detail_page_url)
diff --git a/tests/test_helpers_items.py b/tests/test_helpers_items.py
index 2f0dea6..7979c91 100644
--- a/tests/test_helpers_items.py
+++ b/tests/test_helpers_items.py
@@ -5,7 +5,7 @@
 
 
 class MockedItem(mock.MagicMock):
-    def __init__(self, asin):
+    def __init__(self, asin) -> None:
         super().__init__()
         self.asin = asin