When you purchase Office 365 operated by 21Vianet in China, you choose either to pay by invoice, or by online payment using Alipay or China UnionPay. You can change your payment method later by calling support and going through the purchasing process again.
Note: If your Office 365 subscription costs under a certain amount of money (this amount varies by service location), the invoice payment method is not available as an option. If your subscription costs over a certain amount of money, you will have the option to pay by invoice. A credit check may be required for larger invoice payments.
Wait while the support agent puts your subscription in a “canceled – reduced functionality” or “expired” state. Don’t worry, your users will still be able to use their services during this time.
While on the phone with the service agent, purchase a new subscription and, during checkout, choose the payment method you want to switch to.
After you complete these steps, your payment method will be changed and your users will continue to have the same license assignments as before.