This method accepts an XML document containing information about the account. The required parameters are the username and password of the account. The account APIKEY can be used as the password.
The account element must have the action value "modify" for any changes to be saved
The parameters can be sent as post fields as in the form above or posted as XML like follows:
<request>
<auth>
<username>username</username>
<password>password</password>
</auth>
<account>XML content in the format returned by XML getAccount</account>
</request>