Where can I find information on creating a cryptocurrency acceptance and payment service?

Question

Payment systems

I want to create a service - cryptocurrency payment processing.
So that you can connect to the service and start accepting, for example, Bitcoins or sending them.
I would be grateful for links to the most important sources of Developer descriptions and libraries.
I know that there are ready-made such services, but I'm interested in studying and creating it myself.

Answer 1

https://habr.com/post/350430/