https://learn.microsoft.com/en-us/partner-center/security/manage-customer-account-and-billing
Manage customer accounts and billing - Partner Center | Microsoft Learn
Learn about the set of recommendations for managing customer accounts and billing.
manage customer accountsbilling partnercentermicrosoftlearn
https://www.att.com/support/smallbusiness/article/wireless/KM1044966/
Find Out Who Can Manage AT&T Accounts Online - AT&T Business Mobile phone Customer Support
find out who