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.