Create payment-gateway.md

blockchain_integration/pi_network/pi_network_university/docs/payment-gateway.md

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+# Payment Gateway
+================
+
+The Payment Gateway system allows users to make payments for courses and other services.
+
+## Features
+
+* Secure payment processing
+* Support for multiple payment methods (e.g. credit cards, cryptocurrencies)
+* Payment tracking and history
+
+## API Endpoints
+--------------
+
+### Payments
+
+* **GET /payments**: Retrieve a list of all payments
+* **POST /payments**: Create a new payment
+* **GET /payments/:id**: Retrieve a specific payment by ID
+* **PUT /payments/:id**: Update a specific payment by ID
+* **DELETE /payments/:id**: Delete a specific payment by ID