It’s funny, this is answered in several different places, but we have to say it again here, because we get this exact question a lot. ;)

Returnly uses item(s) weight data from your online store along with the shopper’s address to create a label in real time. Rates for USPS are based on commercial pricing, item weights and postal zones. Rates for UPS and FedEx correspond to your negotiated UPS or FedEx account pricing

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