How can we use GetChangePasswordUrl web service in OpenText Appworks 16.6

We need to reset the Appworks password externally from the login screen. So we have found the GetChangePasswordUrl web service to fulfill our requirements but are unable to use the same because it is not mentioned in any of the OpenText documentation.

So please help us in using this web service or any other method to reset the OpenText Appworks Password from the login page itself.