Diagnose and fix several issues in an existing WooCommerce store, including checkout behavior, product variations, shipping rules, and email notifications. The freelancer should first reproduce and document each issue, then apply safe changes and verify that normal purchasing flows continue to work. The successful freelancer will be expected to work independently, share progress at agreed checkpoints, and raise questions early when a requirement needs clarification. All submitted work should be original, well organized, and ready for practical use after reasonable review.