Sincere apologies for the delay in response on this. While we still do not have such actions in our Trello connector, you can certainly use HTTP or SDK to execute it. Trello authenticates using API keys, so you may be able to use Basic Auth for this. In terms of SDK, you can learn about that here: https://docs.workato.com/developing-connectors/sdk/authentication/basic-authentication.html I hope this helps!
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Trello Custom Action support
I'm trying to do some things with the Trello connector that are not already listed as available actions. I'm not doing anything too complicated -- just adding an attachment (see https://developers.trello.com/reference/#cardsidattachments-1) -- and was hoping to be able to use a Custom Action, but there doesn't seem to be support for that in the Trello app.
Also, Trello authentication doesn't seem to match any of the auth paradigms in Workato, so I can't easily use the SDK to create a custom Trello connector either.
(a) Is there planned support for Trello custom actions, or (b) would it be possible to share how authentication for Trello was implemented in Workato?