diff --git a/.github/workflows/pythonapp.yml b/.github/workflows/pythonapp.yml
new file mode 100644
index 0000000..1e8aafe
--- /dev/null
+++ b/.github/workflows/pythonapp.yml
@@ -0,0 +1,30 @@
+name: Python application
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python 3.7
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.7
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements.txt
+    - name: Lint with flake8
+      run: |
+        pip install flake8
+        # stop the build if there are Python syntax errors or undefined names
+        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+#    - name: Test with pytest
+#      run: |
+#        pip install pytest
+#        pytest
diff --git a/rechnung/contract.py b/rechnung/contract.py
index 09fd726..64b4094 100644
--- a/rechnung/contract.py
+++ b/rechnung/contract.py
@@ -31,17 +31,6 @@ def get_contracts(settings, year=None, month=None, inactive=False):
     return {k: contracts[k] for k in sorted(contracts)}
 
 
-def create_contract(customer, positions):
-    contract_data = customer
-    contract_data["product"] = positions[0]
-    contract_data["product"]["price"] = round(
-        positions[0]["price"] * 1.0 + settings.vat, 2
-    )
-    contract_data["email"] = customer["email"]
-
-    return contract_data
-
-
 def render_contracts(settings):
     template = get_template(settings.contract_template_file)
     logo_path = settings.assets_dir / "logo.png"
@@ -74,22 +63,6 @@ def render_contracts(settings):
             )
 
 
-def save_contract_yaml(settings, contract_data):
-    outfilename = settings.contracts_dir / contract_data["cid"] + ".yaml"
-    try:
-        with open(outfilename, "x") as outfile:
-            outfile.write(yaml.dump(contract_data, default_flow_style=False))
-    except FileExistsError:
-        print("Contract {} already exists.".format(outfilename))
-
-
-def create_yaml_contracts(settings, customers, positions):
-    for cid in customers.keys():
-        print(f"Creating contract yaml for {cid}")
-        contract_data = create_contract(customers[cid], positions[cid])
-        save_contract_yaml(settings, contract_data)
-
-
 def send_contract(settings, cid):
     mail_template = get_template(settings.contract_mail_template_file)
     contract_pdf_path = Path(settings.contracts_dir) / f"{cid}.pdf"
@@ -153,8 +126,3 @@ def send_contract(settings, cid):
             settings.password,
             settings.insecure,
         )
-
-
-def create_contracts(settings):
-    positions = get_positions(settings.positions_dir)
-    create_yaml_contracts(settings)