Скачать или смотреть PayPal Payment Integration in .NET Core | Create & Redirect Flow

In this video, I’ll show you how to integrate PayPal into a .NET Core backend using an API-to-API payment flow.
This approach is suitable for separated frontend and backend architectures.

Payment flow:
Client → .NET Core API → PayPal → .NET Core API → Frontend

🔹 Step-by-step Implementation
Step 1 – Create or Upgrade a PayPal Business Account
Register or upgrade to a PayPal Business account
Go to PayPal Developer Dashboard
Create Sandbox accounts

Get:
ClientId
ClientSecret

Step 2 – Configure PayPal in .NET Core
Store PayPal credentials securely

Choose environment:
Sandbox
Live
Initialize PayPal HTTP Client

Step 3 – Create Payment API
Example endpoint:
POST /api/payment/create
Backend responsibilities:
Receive order information from the client
Build a PayPal payment request
Define:
return_url (payment success)
cancel_url (payment cancellation)

Step 4 – Send API Request to PayPal
Backend sends the request to PayPal (API to API)
Receive:
Payment ID
PayPal approval (checkout) URL

Step 5 – Redirect User to PayPal Gateway
Backend returns the approval URL to the frontend
Frontend redirects the user to PayPal for payment

Step 6 – PayPal Redirects Back
After payment:
PayPal redirects to:
return_url → Payment success
cancel_url → Payment canceled

Step 7 – Handle PayPal Callback on Backend
Backend receives PayPal callback data
Verify the payment status
Update order/payment records
Redirect user back to frontend with final result
✅ Final Result
Secure PayPal payment flow
Backend fully controls business logic
Frontend only handles redirection and UI

🛠 Technologies Used
ASP.NET Core / .NET Core
PayPal REST API
API-to-API payment architecture

github link: https://github.com/CalmNguyen/api-ret...

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