You can use the API login to generate the Token using your credentials of your Pegasus Gateway.
Example from API Login in Postman
Once with the session started you can do the request with the API link, in the tool Postman the session of the API Login is saved and you don’t need to add the Header Authenticate with the Token, but is you wanted you can take the data of the field auth of the response of the API Login.
In the request select the method POST and use the URL provided previously, in the field Body select raw and JSON to send in this format, and type the parameters in JSON format, now only need to send the request.
If the response code is 200, the request was sent correctly.
If you want to delete the association you can use the same URL API and only need to modify the method and the body, as shown in the image.
Only need to change the method to DELETE and send in the body the primary_id of the association.