1. Log into your administrative account.
2.) Go to View Customer List
3.) Find the customer, and then click on the paper and pencil icon under the "Edit" column.
4.) Check the box next to Prepaid (near bottom of the page). You will get a warning message explaining that this will set the customer so that any users under the account will have to pay for their orders with a credit card. Click OK to proceed or Cancel.
5.) Be sure to click the Save button at the bottom of the Edit Customer page to save your change/s.
Now any user setup under this customer account will be required to pay for orders by credit card.