How to send data to API address using webhook?

Question

API

Help set up sending form data from a tilde site to another site. Another site does not connect to the tilde, only through the API.
The tilde itself in the documentation says that using Webhook, you can send form data to e-mail. Tilda provides the ability to connect a script that will do all this. How to make the same data come to the API address of another site and what code is needed for this?