Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

How is it possible that a preauth sticks to a credit card for 30 days, even though the goods have already been delivered?
The answer to your question is very simple: The preauth and the shipment of the goods have no connection within the credit card system. It is possible to process a payment that does not cancel a preauthorization. This is needed for the case where you place two orders and the one you placed second ships first. A preauth can remain active for some time unless it is captured or cancelled. So in your case a preauth was placed and remained active. That you were shipped and billed for some goods had no effect on the preauth because one side or the other failed to attach them.