I want to create a card button that takes information from custom fields such as "email" and send that to Mail Chimp or a Zap webhook to add that email to a subscriber list.
How can I get that custom field data into the JSON for the button POST action, or is there another way?
@Dallin WatsonAs per your question and your tags, I understand you want to use card buttons with butler.
However to use card buttons, you need to program your own power-up. That's quite a process, described here: https://developers.trello.com/reference#power-ups-intro
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