Send a custom field from a flow to another app at the point where your automation has the value it needs.
What AP3K supports
AP3K does not currently offer a native Zapier app with account-wide contact event triggers. You can send data from an AP3K flow using its External request / Zapier action. Updating a custom field elsewhere does not automatically notify Zapier.
Set the field before the request
Add a Set field action using your field key, then place the webhook action after it. Reference that exact key inside a JSON string.
Example payload
{"event":"plan_updated","plan":"{{plan}}"}Replace plan with the key your flow actually sets.
Configure and test
Connect the flow to a Zapier Catch Hook. Publish and run a real test interaction, then inspect the receiving record. Preview does not send an external request.
Avoid duplicate actions
A flow can reach an external request on separate runs. Design the receiving workflow to update an existing record when appropriate, and use the One DM per user rule where it fits your campaign.