With the current functionality, there is not a direct way to add a card to a pending purchase. So let s say someone checks out with a manual billing or invoice payment option instead of the credit card option, but later wants to pay it off via card instead, currently there is not way to manage or add a card in the backend of the dashboard. The manage payment just goes to a blank manage page. Add the ability to add a credit card to pay off the pending invoice and mark as fully paid. Also until the purchase is active and paid, it does not show on the order history or in their dashboard if they click that making it even more invisible and impossible to payoff later.