If a customer has a monthly membership that doesn't have payment information saved, or they would like you to change how they are billed on their behalf, you can add a new payment method to their membership.
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To do this go to their membership detail page (Customers >> Customer List >> Choose the desired customer >> Membership tab >> Choose active membership), click Payment method and you will see an option to add or change Payment Method.

You will then be taken to a page where you will be able to add new payment information and choose from the available payment methods.

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