If you as a Client are being billed for subscription-based services or products, you can easily save your payment details so that you are automatically billed each time you are invoiced. Your credit card information can be used to pay the Invoice and be securely stored for future Auto-Billing transactions on this Invoice.

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https://www.freshbooks.com/support/i-m-a-client-how-do-i-pay-my-invoices-automatically