Who knows a gem for connecting a payment aggregator?

Question

Ruby on Rails

Hello!
Who has ever connected payments to projects. What did they use? Did you write the integration yourself? Or is there any good gem for this?
Requirements for the aggregator:
1) work with individuals 2) the possibility of a
refund
The author wrote a question.

Answer 1

https://github.com/Shopify/active_merchant
https://github.com/Shopify/offsite_payments