# 💳 Payment Processing System > A modern, microservices-based payment gateway built for scale, security, and learning ## Docs - [Auth API](https://docs-paymentgateway.redahaloubi.com/api/auth.md): User authentication, authorization, and API key management - [Merchant API](https://docs-paymentgateway.redahaloubi.com/api/merchant-api.md): Merchant account management, team collaboration, and business settings - [Payment API](https://docs-paymentgateway.redahaloubi.com/api/payment-api.md) - [Introduction](https://docs-paymentgateway.redahaloubi.com/get-started/introduction.md): A modern, microservices-based payment gateway demonstrating production-ready architecture and PCI compliance - [Quick Start](https://docs-paymentgateway.redahaloubi.com/get-started/quick-start.md): Create your first payment intent and process a payment in 5 minutes - [Hosted Checkout](https://docs-paymentgateway.redahaloubi.com/integrations/checkout.md): Integrate the secure hosted checkout page for browser-based payments - [CLI Tool](https://docs-paymentgateway.redahaloubi.com/tools/cli.md): Command-line interface for testing and managing Payment Gateway ## OpenAPI Specs - [openapi](https://docs-paymentgateway.redahaloubi.com/api-reference/openapi.json)