This endpoint returns the key and prefix you'll need for the pay endpoint. Prepend the prefix to the credit card number, then use RSA/OAEP/SHA1 encryption on the resulting string using the provided modulus and exponent.The "Example Payment Flow" section details the process and sample code (Java) is provided in this section under "Example Code".
A quick search revealed - https://community.clover.com/questions/3241/how-to-integrate-clover-payment-api-from-web-app-i.html which may be helpful for you.
How do I make first payment with test card. Can you please give me api request to make first payment on created order. @David Marginian
1 Person is following this question.