To use Basic Authentication-based APIs, you can either use the credentials themselves or generate an authorization header.
After you obtain the credentials, you simply use them to authenticate when you invoke the API.
Obtaining the credentials
Get the credentials from the Basic Authentication pane.
Using an authorization header
An authorization header is a request type header that contains the credentials information and is used to authenticate a user through a server.
Use the value in the Header Token field in your authorization header.
You can obtain an authorization header from the Header Token field in the API group pane under the Basic Auth segment in Postman, for example.