Verify Meta Webhook

GET

Meta calls this URL once during webhook setup. Register it as the Callback URL in Meta Developer Console. The verify_token must match the value from set_cloud_webhook.

API endpoint

https://waclient.com/api/webhook/META68B6ED90CXXXX

Example:

curl -X GET \
  'https://waclient.com/api/webhook/META68B6ED90CXXXX' \
  -G \
  --data-urlencode 'hub_mode=subscribe' \
  --data-urlencode 'hub_verify_token=my_verify_token' \
  --data-urlencode 'hub_challenge=CHALLENGE_STRING'

Response

CHALLENGE_STRING

Parameter	Description
hub.mode	Must be `subscribe`
hub.verify_token	Same verify_token saved via set_cloud_webhook
hub.challenge	Challenge string returned by Meta

Plain-text response (not JSON). Meta sends hub.mode=subscribe; your server echoes hub.challenge when verify_token matches.

Set Webhook Receive Meta Webhook