How We Built a WordPress Invoice Plugin: Architecture, Security and Lessons Learned

The full build log of our WordPress invoice plugin: what it does, how its data model and REST API are designed, the security model, the bugs we fixed, and what it took to prepare it for the WordPress.org directory.
Validating Bangladeshi Mobile Numbers in a Checkout Form

A regex-based fix that validates real Bangladeshi mobile numbers on a WooCommerce order form, checked client-side and server-side.
Auto-Selecting Free Shipping at a Cart Threshold in WooCommerce

WooCommerce won’t auto-switch a customer onto Free Shipping once their cart qualifies. Here’s the fix, without overriding a real customer choice.
Letting Admins Change a Product Variant After an Order Is Placed

WooCommerce has no built-in way to swap a line item’s variation post-checkout. Here’s how we added one that works on orders past the pending stage.