You can retrieve API Keys for user accounts by submitting a request with the Username and Password of an MPZMail account.
You can alternatively ask users to retrieve their own API Keys manually via the "My Account" area of the MPZMail control panel.
Submit an XML Request with the following details:
Post URL: https://mpzmail.com/api/v3.0/auth/
Fields to Post
The username of the MPZMail user
The password of the MPZMail user
Data Sent Back
Indicated wether an error has occured. 0 for no error. 1 for error.
If there's been an error, a text description of the error that occured will be here.
If successful you will receive the APIKEY of the user here.