Update OpenAPI generator config and templates

Switched the generator to php-nextgen and adjusted paths. Enhanced README with additional API details and usage instructions. Updated composer.mustache with clearer package description.

Author: tups

config-openapi-generator.yml

@@ -1,5 +1,5 @@
 # config-openapi-generator.yml
-generatorName: php
+generatorName: php-nextgen
 outputDir: .
 inputSpec: https://api.brevo.com/v3/swagger_definition_v3.yml
 gitHost: github.com
@@ -12,7 +12,7 @@ templateDir: ./template/php-nextgen
 invokerPackage: Brevo\Client
 artifactVersion: 3.0.0
 packageName: Brevo\Client
-srcBasePath: src
+srcBasePath: lib
 variableNamingConvention: camelCase
 
 # Server configuration

template/php-nextgen/README.mustache

@@ -1,4 +1,4 @@
-# {{packageName}}
+# {{artifactDescription}}
 
 {{#appDescriptionWithNewLines}}
 {{{.}}}
@@ -8,6 +8,9 @@
 For more information, please visit [{{{infoUrl}}}]({{{infoUrl}}}).
 {{/infoUrl}}
 
+Brevo's API matches the [OpenAPI v2 definition](https://www.openapis.org/). The specification can be downloaded [here](https://api.brevo.com/v3/swagger_definition.yml).
+
+
 ## Installation & Usage
 
 ### Requirements
@@ -20,14 +23,8 @@ To install the bindings via [Composer](https://getcomposer.org/), add the follow
 
 ```json
 {
-  "repositories": [
-    {
-      "type": "vcs",
-      "url": "https://{{gitHost}}/{{gitUserId}}/{{gitRepoId}}.git"
-    }
-  ],
   "require": {
-    "{{gitUserId}}/{{gitRepoId}}": "*@dev"
+    "{{gitUserId}}/{{gitRepoId}}": "*"
   }
 }
 ```
@@ -135,6 +132,21 @@ vendor/bin/phpunit
 {{/-last}}{{/apis}}{{/apiInfo}}
 ## About this package
 
+## partner-key
+
+The partner key should be passed in the request headers as `partner-key` along with `api-key` pair for successful authentication of partner (Optional).
+
+- **Type**: API key
+- **API key parameter name**: partner-key
+- **Location**: HTTP header
+
+
+If you find a bug, please post the issue on [Github](https://github.com/getbrevo/brevo-php/issues).
+
+As always, if you need additional assistance, drop us a note [here](https://account.brevo.com/support).
+
+You can generate the PHP code with the CLI command: openapi-generator generate --skip-validate-spec -c config-openapi-generator.yml
+
 This PHP package is automatically generated by the [OpenAPI Generator](https://openapi-generator.tech) project:
 
 - API version: `{{appVersion}}`
@@ -146,3 +158,4 @@ This PHP package is automatically generated by the [OpenAPI Generator](https://o
 {{/hideGenerationTimestamp}}
     - Generator version: `{{generatorVersion}}`
 - Build package: `{{generatorClass}}`
+

template/php-nextgen/composer.mustache

@@ -2,10 +2,7 @@
     {{#composerPackageName}}
     "name": "{{.}}",
     {{/composerPackageName}}
-    {{#artifactVersion}}
-    "version": "{{.}}",
-    {{/artifactVersion}}
-    "description": "{{{appDescription}}}",
+    "description": "Official Brevo provided RESTFul API V3 php library",
     "keywords": [
        "brevo",
        "swagger",