WooCommerce Shipping is a free label-printing and fulfillment extension built into WooCommerce that lets store owners buy and print USPS, UPS, DHL Express, and FedEx labels directly from their dashboard. It uses Woo's own carrier accounts for discounted commercial rates, so merchants don't need separate accounts with each carrier. It compares live label rates, generates tracking numbers automatically, and supports split shipments. All shipments are 100% carbon neutral.
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This has been added in version 2.0.0:
https://woocommerce.com/document/woocommerce-shipping/#return-labels