What are the options for accepting SMS payments on the site (Ruby On Rails)?

Question

Ruby on Rails

Good afternoon.
Soon I'm going to open a web service with the ability to pay for services by sending a user sms with a code to a certain phone number.
After a long search, I didn't really find anything.
Advise the easiest options to implement.
Preferably with the ability to quickly integrate (Ruby / Rails).
Thank you in advance.

Answer 1

https://github.com/Shopify/offsite_payments
well, you choose the one who supports sms