If you're not already billing manager for the organization, an organization owner at your client will need to add you to the organization as a billing manager. See Adding a billing manager to your organization.
Renewing a client's paid plan
If your client's organization already has a valid payment method, the plan will automatically renew at the start of each billing cycle. Otherwise, you or the client will need to add a payment method.
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In the upper-right corner of any page on GitHub, click your profile picture, then click Settings.
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In the "Access" section of the sidebar, click Organizations.
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Select an organization by clicking on it.
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Under your organization name, click Settings. If you cannot see the "Settings" tab, select the dropdown menu, then click Settings.

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If you are an organization owner or billing manager, in the "Access" section of the sidebar, click Billing and licensing.
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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.
Upgrading the number of paid seats
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In the upper-right corner of any page on GitHub, click your profile picture, then click Settings.
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In the "Access" section of the sidebar, click Organizations.
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Select an organization by clicking on it.
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Under your organization name, click Settings. If you cannot see the "Settings" tab, select the dropdown menu, then click Settings.

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If you are an organization owner or billing manager, in the "Access" section of the sidebar, click Billing and licensing.
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Under "Current plan", next to the name of your plan, select Edit and click Add seats.
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Under "Add seats", type the number of seats you'd like to add.
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Click Add seats.
After you add seats, the payment method on file for the organization will be charged a pro-rated amount based on the number of seats you're adding and the amount of time left in your billing cycle.
Downgrading an organization's plan to free
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In the upper-right corner of any page on GitHub, click your profile picture, then click Settings.
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In the "Access" section of the sidebar, click Organizations.
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Select an organization by clicking on it.
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Under your organization name, click Settings. If you cannot see the "Settings" tab, select the dropdown menu, then click Settings.

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If you are an organization owner or billing manager, in the "Access" section of the sidebar, click Billing and licensing.
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Use the Edit drop-down and click Downgrade to GitHub Free.
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Read the information about the features your organization will no longer have access to on your next billing date, then click I understand. Downgrade my organization.