External API call (webhook) to update a form field in real time

Hello everybody, hope you all are good !
Does anybody know how to make an external API call to update a form field in real time?
I already tried this using a GAS (google apps script) published as a web application actioned by an “External: go to a website” Action. But it delays to show the updated field.
Thanks in advance !

Not possible. Webhooks (outgoing API calls) can only be done from bots, which are run on the server, not while a form is open.

Hi @Steve, thanks for you rapid reply. In fact, I already got this using a GAS (google apps script) published as a web application actioned by an “External: go to a website” Action. The problem was the delay to see updated data.

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