The selectedIds get passed in based on the resource being viewed at the time. There’s a good chance the panel systems strips out existing query parameters when it builds the Iframe URL. You shouldn’t really include them if you can. Just put your full url as the Iframe url https://ethereal-crayon.glitch.me
You may also have to deal with timeouts. Since your glitch app is sleeping when not in use, Pipedrive may say it takes too long and cancel the request (I’m just guessing based on how it handles JSON panels).
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