In the event that a task did not process due to a failed payment and you accidentally give the customer their mail, you should attempt to process the task again, after the customer updates their payment method. You can also mark the mail item as picked up manually. Marking the mail item as picked up manually is usually done as a courtesy and does not charge the customer any pick up fees. Please be sure to decline the current pickup task first before proceeding with marking mail as picked up manually. 

Note: To avoid this issue in the future, we recommend processing the task before handing the mail item to the customer. If the customer's payment does not process, the customer should update their payment at the time of the pickup.