Integrate crypto payment system to my website

I currently have a website that accepts credit card but want to switch exclusively to crypto payments.

I want a user to be able to come to my website, connect wallet, buy site credits with crypto and then be able to swap back to crypto on their way back out.

I don't want the currency converted to fiat or stable coin, it should just sit in a decentralized transaction wallet.

I want to use my own BSC token which limits me in which API's I could use.