Integrate External APIs with the API Gateway

References implementation for the integration of external APIs (OpenAI, Watson, Google Cloud) into the API Gateway.

Set up API clients for external services (OpenAI, Watson, Google Cloud) and create a references' implementation
Implement methods in the Gateway to interact with these external APIs
Ensure proper authentication and error handling for external API calls
Create a test pipeline for the implementation
Document the integration process and usage guidelines

AKissMail / MIRAGEXR_AI_service-backend