I am making an Android app with Kotlin and AWS where users will be able to directly make payments to one another for various products/services. For now I want those payments to be through credit cards with a small fee going to the developers. I am looking for a convenient API to accomplish this. I've looked into Google Pay, Stripe Connect and Smart2Pay. What would you recommend me to use? It doesn't have to be any of the ones I've mentioned. Also some guides are welcome on how to accomplish this are always welcome as I've never tried to setup a payment system in an Android app.