Prerequisites for Payment Gateway Testing

You need to do the following before you begin testing.

1. Gather proper data for the dummy cards, including visa, master, etc.
2. Gather payment gateway information, like PayPal.
3. Gather error codes related to the payment gateway.
4. Know the parameters that are passed through the payment gateway.
5. Know the information that are passed through query string.
6. Check the language of the payment gateway and the application.

References – https://www.360logica.com/blog/