Unable to generate AutoReceipts for credit-card-invoice, if customer 'deletes' card via iStore Accou

Hello;

We have a scenario that arises periodically, which surprises me, and I'm wondering if others have experienced it or have workarounds or suggestions.

We are a 100% drop-ship Ecommerce retailer, operating an Oracle iStore website, feeding those orders into Order Mgmt, triggering Purchase Orders (transmitted to our vendors who deliver the goods directly to the end customer); once we perform PO Receipt, Autoinvoice generates customer A/R and (for customers who placed their iStore Orders with a credit card) then AutoReceipts creates the credit card cash receipt and we go through AutoRemittance & Settlement.

We authorize the entire Order Amount to the customer's credit card, at the the time the customer checks-out with their iStore order.  Assuming our Authorization was successful, all of the steps (above) then happen.