Intergrating payment gateway api to an appguyver app

Hello guys my name is Collins am from Nigeria.
Am building a pizza restaurant app but I would want to integrate a payment gateway ( Paystack) secret key and private key API to my pizza app . Please how do I go about it?

Good day, I don’t know anything about paystack, but if you can to use Stripe instead, there are tutorials on the forum showing how to do it.