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Updates user account information for the particular user.
Global parameters are not shown here for clarity, but should be present in all requests
<?xml version="1.0" encoding="utf-8"?>
<ApiResponse Status="OK" xmlns="http://api.namecheap.com/xml.response">
<UserUpdateResult Success="true" UserId="123" />
Specifies the error codes that might be returned from this method
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