How to integrate a UPI payment gateway in Android?

To integrate a UPI payment gateway in an Android application, you can follow the NPCI guidelines for UPI deep linking or intent flow. This involves:

• Registering as a merchant with a UPI-enabled bank to obtain a Virtual Payment Address (VPA).
• Generating a standard UPI URI string containing parameters like payee VPA, name, transaction reference ID, and amount.
• Using an Android Intent to launch the UPI application chooser on the user's device.
• Handling the transaction response in the onActivityResult method to verify the payment status.