In the beginning, you can create an Authentication mode that will help you to have a securised connection. If you choose so : you must enquire a name, choose a type of authentication then add your login and password. Your password and login will be stored in a securised space.
An example of creation of an authentication :
Then, at the creation of the template, you can chose an authentication mode. An URL is required, it will be there the hook will be sent. The type of Hook (Text, JSON or XML) must be chosen too.
An example of creation of a Hook template: