Setting Up the Payment Verification Endpoint

The payments.VerifyPaymentAPI() function from the KarmaGo package simplifies payment verification by returning a handler function that integrates seamlessly with the GoFiber (opens in a new tab) framework. This endpoint is essential for validating payments after they are completed.

Prerequisites

Before setting up the verification endpoint, ensure:

Environment Variables are Properly Configured Set the KARMAPAY_VERIFY_URL in your .env file to the endpoint where you’ll handle payment verification. For example:
```
KARMAPAY_VERIFY_URL=https://yourdomain.com/payments/verify
```
GoFiber Installed If GoFiber is not already installed in your project, add it using:
```
go get github.com/gofiber/fiber/v2
```
KarmaPay PG Service is Running Ensure the KarmaPay PG Service is up and running with the correct environment variables.

Creating the Verification Endpoint

The payments.VerifyPaymentAPI() function provides a Fiber handler that validates the payment details. You just need to register it to your Fiber application.

Example Code

Here’s how you can set up the verification endpoint:

package main
 
import (
	"github.com/gofiber/fiber/v2"
	"github.com/MelloB1989/karma/payments"
)
 
func main() {
	// Initialize Fiber app
	app := fiber.New()
 
	// Define the payment verification route
	app.Post("/payments/verify", payments.VerifyPaymentAPI())
 
	// Start the server
	if err := app.Listen(":3000"); err != nil {
		panic(err)
	}
}

How It Works

Route Handling The route /payments/verify listens for POST requests. This should be the URL you set in the KARMAPAY_VERIFY_URL environment variable.
Verification Logic
- The payments.VerifyPaymentAPI() function handles the logic for validating the payment.
- It ensures that the payment details match those stored temporarily in Redis (via the KarmaPay PG Service).
- The function also checks the payment status with the respective payment gateway.
Environment Variable Linking The KARMAPAY_VERIFY_URL variable connects your Go application to the KarmaPay service, ensuring the verification endpoint is properly registered.

Example `.env` File

Make sure your .env file includes the correct URL for verification:

KARMAPAY_VERIFY_URL=https://yourdomain.com/payments/verify

Testing the Verification Endpoint

Simulate a Payment Use the CreatePaymentOrder function to generate a payment URL and complete a transaction.
Webhook Callback The payment gateway triggers the verification endpoint upon successful payment. Ensure the endpoint is reachable and correctly configured.
Verify the Results Check the response from the verification API to confirm the payment is valid.

Notes for Beginners

The VerifyPaymentAPI() function is plug-and-play. You don’t need to write additional code to handle the verification logic unless you have custom requirements.
Ensure that your WEBHOOK_SECRET is properly set and matches the configuration in your payment gateway to validate webhook authenticity.

Troubleshooting

Invalid Payment State: Ensure Redis is accessible and properly configured.
Incorrect URL: Verify the KARMAPAY_VERIFY_URL is correct and points to your verification route.
Webhook Not Triggering: Double-check your payment gateway settings and webhook configuration.

By following this guide, you’ll have a fully functional payment verification endpoint integrated into your GoFiber application. This ensures smooth and secure validation of all transactions handled by KarmaPay.

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