How Do I Change the Billing Mode of a VPN Gateway from Pay-Per-Use to Yearly/Monthly?

A pay-per-use VPN gateway is billed by bandwidth.
To change the billing mode of a VPN gateway billed by traffic from pay-per-use to yearly/monthly, first change the VPN gateway from being billed by traffic to being billed by bandwidth and then from pay-per-use to yearly/monthly.

Perform the following operations:

Log in to the management console.
Click in the upper left corner and select the desired region and project.
Click Service List and choose Networking > Virtual Private Network.
In the navigation pane on the left, choose Virtual Private Network > Enterprise – VPN Gateways.
On the VPN Gateways page, locate the row that contains the target VPN gateway, choose More > Change Billing Mode in the Operation column.
In the Change Billing Mode dialog box, click OK.

The billing mode of a VPN gateway cannot be changed from yearly/monthly to pay-per-use. The resource quotas of a yearly/monthly VPN gateway can be decreased upon a renewal.
Confirm the VPN gateway information, set a renewal duration, and click Pay.
On the payment page, confirm the order information, select a coupon or discount, select a payment method, and click Pay.

Changing the billing mode of a VPN gateway from pay-per-use to yearly/monthly will not affect your services.