A backup credit card is a credit card that you designate to be used if your primary form of payment fails. If your primary form of payment is ever declined when processing a payment, we'll automatically try to charge the payment to your backup credit card instead. This helps ensure that your service runs continuously. To assign a credit card to be your backup credit card:

1. Sign in to the Google Admin console. 
2. Do one of the following:
   • In the classic Admin console, click Domain Settings > Subscriptions & Billing > Access billing account.
   • In the new Admin console, click Billing > Access billing account.
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3. Click on the Settings tab.
4. In the Your selections section, click Edit.
5. Click the Add form of payment link.
6. Fill out your card information, then click Save. When you're directed back to the Settings tab, click Edit in the Your selections section.
7. Click the drop-down menu next to Backup and select the credit card you just added.
8. Click Save.