This is a simple authentication method whereby a custom string is placed into the Authorization header field for your webhook requets.

You may choose to use any header value.

For example:

Basic aHR0cHM6Ly93d3cueW91dHViZS5jb20vd2F0Y2g/dj1kUXc0dzlXZ1hjUQ==

or

MyWebhookAuth 9d1CfE40gqBLgBiJBzSzae441mL5ABu8