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My previous online store used USPS Flat Rate Shipping extensively. The current USPS module does not support Priority flat rate shipping. It seemed simple enough to use the flat rate module but I am unable to access the order's total weight in rules which would act as a rough system to force larger (heavier) orders to Medium or Large Flat Rate as appropriate. From a bit of research it seems the Flat rate module is lacking integration with the Physical product API which would provide this functionality for rules.