What information is necessary to sign up a Sub Account to my master account?

To sign up a sub user on your account, you'll need to provide Encoding.com with a few pieces of information on the sub user. 

<?xml version="1.0"?>
<query>
<!-- Main fields -->
<userid>[UserID]</userid>
<userkey>[UserKey]</userkey>
<action>AddSubUser</action>
<user_data>
<email>[Email]</email>
<login>[Login]</login>
<password>[Password]</password>
<first_name>[FirstName]</first_name>
<last_name>[LastName]</last_name>
<phone>[Phone]</phone>
</user_data>
</query>

You'll receive the following response back from the system once the user has been created:

<?xml version="1.0"?>
<response>
<action>addsubuser</action>
<status>Success</status>
<result>
<plan>Max</plan>
<user_id>New_UserID</user_id>
<user_key>Unique_subaccount_API_key</user_key>
<message>The new sub user has been created</message>
</result>
</response>