WooCommerce USPS Shipping Version 5.5.4 Changelog

* Fix – Correct large envelope (flat) classification to match USPS standards — items that exceed any (previously all) of letter dimension now qualify as flats.
* Fix – Legacy API credential validation no longer runs when switching to REST API, preventing headers-already-sent warnings.
* Fix – Validate empty Origin Postcode: show admin notice on save and skip API requests.
* Fix – FCPIS rates incorrectly filtered for valid custom boxes.
* Tweak – Hide product-level "Envelope" checkbox when REST API is active, as it only affects Legacy (SOAP) API rates.
* Tweak – WooCommerce 10.7 Compatibility.

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