You can change the payment type for any recurring plan from cash to card at anytime before the next bill date.
If they have a Credit Card on file already, that will be an available choice, if not you can request or add a credit card first.
Go to their member detail page
Use the context menu next to the plan you want to change
Select 'Change Billing Method'.
From the modal select the new billing source (cash or card on file)
Save changes.
