USPS

4Psite enables you to process and ship orders through our server to server integration with USPS (Endicia & Express 1) and other carriers. 4Psite supports your negotiated rates with USPS, allowing you to continue shipping with any discounts available to you.
USPS integration:
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Print shipping labels and postage for your store
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Add funds directly on 4PSite.
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Domestic and international shipping
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Shipping to military bases (APO/FPO)
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Create custom forms for international and APO/FPO shipping
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Batch or per order operations
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Shipping labels accessible for re-printing
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No exporting or importing operations are required