I give up trying to make this work. First I struggled to find the API keys, then they didn't work. When I got them pasted properly, I couldn't for the life of me figure out where I was supposed to find a Signup ID, and the instructions are not helpful at all. I finally got the right numbers in and now it's just spinning when I try to add a test subscriber! I give up!!
Back to using Gravity Forms and creating a zap to add subscriber via Zapier.
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