Jack Fleming 

First you need to create a webhook in make. Then you need to copy the link in the browser and activate the link. Now you have a webhook. (copy your link in the formula below)

At this moment you still have no data going trough the webhook. For this you have to "redetermine data structure" in the webhook once you made your button with code like this:
BTW: I used the Ninox template "Contacts" and the table Contact.

let me := this;
let url := "https://hook.eu1.make.com/t4jhhkjhkhsdqqs1sypgkggqsf6677ot";
let method := "POST";
let header := {
        'Content-Type': "application/json"
    };
let data := me.{
        kind: text(Kind),
        firstname: 'First name',
        lastname: 'Last name',
        phone: first(Phone[text(Label) = "Home"]).Number
    };
http(method, url, header, data)

From this point, you can connect another module in your make scenario. You should now be able to use the fields you send trough the webhook (kind,firstname,lastname and phone, if you need more fields, just add and redetermine data structure...

Hope this gets you started...

Jack Fleming 

maybe it's a corrs issue. try to wrap your last line in a do as server

....
do as server
   http(method,url,header,data)
end