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I accept PayPal payments on my items and am seeing a new PaymentHoldDetails container and a PaymentStatus field in GetOrders. Should I be changing my fulfilment logic?
No, you don't need to change your order fulfilment logic. Starting in June 2011, a PaymentHoldDetails container and a PaymentHoldStatus field will be returned in GetOrders, if a seller's funds are placed in hold status. This container and field consist of the reason and status of hold, the expected release date of the payment hold, as well as possible actions that a seller can take to expedite the release of the payment hold.
Your application should capture the data returned in this container to get more information about the hold.