If you're not a billing manager 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
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In the upper-right corner of any page on GitHub, click your profile photo, then click Settings.
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In the "Access" section of the sidebar, click Organizations.
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Next to the organization, click Settings.
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If you are an organization owner, in the "Access" section of the sidebar, click Billing and plans.
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At the top of the page, click Payment information .
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Under "Payment method", click New Card.
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Under "Payment method", choose to pay with a credit card or PayPal.
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Complete the payment information form, then click Submit.