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You’d need to log in to your DigitalOcean account, click on your avatar, and then:
Settings => Billing
From there, you can add a credit/debit card, or top off your account using PayPal. If you already have a credit/debit card on file, and it’s valid, DigitalOcean will auto-charge that card at the first of the month.
If you don’t have a credit/debit card, you’ll need to top of your account using PayPal before the first of the month to ensure that your account has enough credit to cover your usage.
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