Zapier Rejecting My App's API Token

Hi All,

I’m doing my first Zapier workflow:

  1. When event invoice_created occurs in Stripe
  2. POST: Send data to my bubble app to start an API endpoint action in my API workflows.

Unfortunately Zapier keeps saying that my app’s API key is invalid or expired. What am I missing?

EDIT This is the status it shows:

EDIT: I have the regular zapier bubble plugin installed. Do I have to set up the API connector for a zapier post? I can’t find my zapier API key in settings or anywhere else in Zapier. I must be missing something.