USPS Shipping for Magento 2 is a build-to-order carrier extension that gives US merchants accurate USPS rates at checkout plus a full back-office label, SCAN-form and tracking workflow — without the per-shipment fees of a hosted shipping app.

This is not an instant Adobe Commerce Marketplace download. ECOSIRE builds the module to fit your store, installs it on your environment, and supports it after go-live. The extension ships as a proper module under app/code/Ecosire/UspsShipping, registering a custom online carrier model that implements Magento\Shipping\Model\Carrier\AbstractCarrierOnline and CarrierInterface. Rate requests are collected through the standard collectRates() flow so USPS quotes appear natively alongside your other methods in the cart and checkout, fully compatible with Open Source (CE) and Adobe Commerce (EE/Cloud).

We wire USPS authentication and endpoints into admin system configuration (system.xml + config.xml) under Stores → Configuration → Sales → Shipping Methods, with credentials stored encrypted. A Commercial/retail pricing toggle requests the correct USPS price tier per service. Label generation, SCAN-form creation and tracking-number write-back are implemented via service contracts and admin controllers gated by granular ACL resources (acl.xml), so only authorized roles can buy postage. Plugins/interceptors (di.xml) and observers extend order shipment creation cleanly without core edits, and a cron job can batch SCAN forms and refresh tracking statuses.

Everything is delivered with REST/GraphQL-friendly extension attributes where you need rates or tracking exposed to a headless or PWA frontend. You get the source, install on staging then production, and an honest delivery timeline up front.