If your client's organization has a valid payment method on file, their yearly paid plan will automatically renew. Billing managers can view and update the organization's payment method and plan.
If you're not a billing manger for the organization, ask your client to have an owner of the organization add you to the organization as a billing manager.
Tip: Billing managers can also change the organization's number of paid seats anytime.
Updating your organization's credit card
In the top right corner of GitHub, click your profile photo, then click Your profile.
On the left side of your profile page, under "Organizations", click the icon for your organization.
Under your organization name, click Settings.
In your organization's Settings sidebar, click Billing.
Click Update payment method.
Type your new credit card information in the secure form.
Click Update credit card or Save credit card.