Integration of payment gateway with payu

Hello everyone, I am trying to integrate a payment gateway PAYU to my application,
I’m going through the API Integration but it’s really costing me a lot, since I’m new to this and I’ve never added a paid payment gateway, a point I do not know how to begin, sorry for my ingorancia in this, but if someone here has implemented payment gateway or could guide me as I could do would be very much appreciated the help

What is your current issue doing the integration?