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Hey @vbouet,
while I did not look at Webflows docs, common things to try would be one of the following or both:

  1. Click add header & add Content-Type as the key & application/json as the value.
  2. Escape your URL from main-image by replacing the URL with <main-image> and adding the URL into the dynamic field that will show after you’ve added this.

Lmk if this works for you.