Correct request:
POST /handler.php HTTP/1.1
Accept: */*
Content-Type: application/x-www-form-urlencoded
Host: isv.endpoint.example.org
Authorization: Basic am9objpxd2UxMjM=
APS_ACTION=TERMINATE&APS_TEST_MODE=N&PURCHASE_ID=12345678&PRODUCT_ID=someproduct1&APS_TERMINATION_DATE=18%2f09%2f2016&PREVIOUS_LICENSE_BODY=NCA4IDE1IDE2IDIzIDQy
Successful response with a body:
HTTP/1.1 200 OK
Date: Sun, 18 Sep 2016 15:02:10 GMT
Server: Web Server
Content-Type: text/plain; charset=UTF-8
License 12345678 is terminated.
Successful response without a body:
HTTP/1.1 204 No content
Date: Sun, 18 Sep 2016 15:02:10 GMT
Server: Web Server