* Tweak – WooCommerce 10.7 Compatibility.

* 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.

* Update – WordPress 6.9 compatible.
* Update – WooCommerce 10.7 compatible.
* Dev – Iterative processing and conversion performance improvements.

* Fix – Correct and add missing rates per April 2026 Royal Mail price guide.
* Fix – Prevent stale rates from previous pricing cycles being served from the database cache.
* Tweak – WooCommerce 10.7 Compatibility.

* New – Added abilities (WP Abilities API) for checkout add-ons: `woocommerce-checkout-add-ons/add-ons-get`, `woocommerce-checkout-add-ons/add-ons-list`, `woocommerce-checkout-add-ons/add-ons-create`
* Misc – Updated the SkyVerge Plugin Framework to v6.1.2

* Fix – Security update.
* Tweak – WooCommerce 10.7 Compatibility.