/users/validate
This web service is a simple callback URL handler that prompts the user to click on a link in an email to validate a newly created account. If the link is valid, the user account is marked as validated, and is redirected to a page for successful activations (you can set the redirect URLs for success and failure in the header of this file).This request handler expects the parameter k={validation key}, in the form:
/users/validate?k={key}