when i pass full Webhook URL i got (1) error, but when i remove https:// i got the (2) error. So i tried a lot of URL formats but nothing is works. Is this method works?
(1) Error: {“status”:400,“data”:{“error”:“The entered URL must not include "http://" or "https://"”}}
(2) Error: {“status”:400,“data”:{“error”:“The entered URL is not valid”}}
Documentation:
P.S. error messages i translated to english
¡Hola! 
Escríbenos a soporteapi@alegra.com contándonos el detalle del caso, y con gusto te ayudaremos a revisar qué puede estar pasando. Nuestro equipo está listo para apoyarte y darte seguimiento lo antes posible. 
Hey! I did one Webhook connection with Make.com using the URL in this way: “hook.us2.make.com/blablabla…” Try to make it like this, also, in the docs there are certain requirements that the webhook needs to fulfill in order to set it up successfully.
Here is the link: Descripción general
It says:
What do I need to use Webhooks?
An Alegra account:
This account will be associated with the subscriptions you create, so you will receive notifications related to it.
A unique URL:
You must have your own URL. This URL must be prepared to receive POST requests via HTTPS.
When creating a subscription, Webhooks will send a POST request with an empty body to the URL you specify. This request must be responded to with a 2XX code within 5 seconds, otherwise the subscription will not be created.
Each time an attempt is made to send a notification (via a POST request with the message content in the body) to your URL, it must return a 2XX code within 5 seconds. If this does not occur within 10 consecutive attempts, your subscription will be automatically deleted.
Hope this helps