How to reach an API with OAuth1.0 using the JWT generate snap?

Hello,

I am trying to use OAuth1.0a to authenticate an API to communicate with the Spotler (e-mail distribution) service. I have reached the point that I know to use SnapLogic to make a signed secret, but don't exactly understand how to get there.

I have firstly made a REST OAuth1 account in the manager section and have given it the consumer key & secret and the endpoints. Next, I would like to use this account in the JWT generate snap to have the secret signed with the HMAC SHA256 algorithm, but this is where I got stuck.

The JWT generate snap requires a completely different account with details I don't quite understand nor have.

Could anyone help me with this issue please? And is this the right way to do it or are there better alternatives?

Thanks.