API authorisation using OAUTH

Questions / Help
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1

Hello,

I am trying to learn Elixir through building a remittance aggregator starting with consuming third party API services like MasterCard.
I tested regaular public API services with Elixir Req and livebook and it is fine but now for such services it is highly secured and encrypted.

Any idea if we have an Elixir library similar to the
one below built by MC team for OAUTH handling using RSA cryptography?

2

Hello,

Or if possible , is it possible to use Java libraries from elixir as the other method would be to utilize MasterCard own library below and add it to project :