Delivery — webhooks, email, Slack
A destination fires on each submission.
Webhook (HTTPS POST)
Section titled “Webhook (HTTPS POST)”Set a webhook URL and each submission is POSTed as JSON.
Verifying the signature
Section titled “Verifying the signature”If you set a signing secret, the request carries an HMAC of the body:
x-freezeforms-signature: sha256=<hex>Recompute HMAC-SHA256 of the raw body with your secret and compare. Reject anything
that does not match — that check is the entire point of the secret. Compare with a
constant-time function, not ==.
Email notifies a recipient that a submission arrived.
Posts a notification to a Slack channel.