micro-transactions without googleplay/google publisher

Hello, I was wondering if it is possible to complete a micro transaction without using googleplay’s services on android.

Basically I have a token system and for the sake of the question lets pretend the token:$ ratio is 1:1

If someone would like 1 token the app would prompt them to pay $1. The user can then pay the 1 dollar via credit card to my credit card and in return the receive a token.

I would like a script that does not require this transfer of funds to go through google play and does not require me to have a google publishers account. Is this possible? I do not require the game to even be on googleplay as this would probably go against their rules. I will use other sites for digital download of the app.

There will be virtually no other services (redeeming etc.).

Technically it is possible - you can for example send paid sms. But you have to remember, that google bans that kind of application - so you will not be able to use google play.