We have been adding gateways to gringotts which is a port of activemerchant from the ROR world so if you could tell us explictly which gateways you need we would implement them in our library.
Introductory post for gringotts https://forum.elixirforum.com/t/gringotts-a-complete-payment-library-for-elixir-and-phoenix-framework/
Thanks!
