My online store is throwing up a handful of critical errors that are costing sales and frustrating customers. Here’s what I already know: • Checkout fails whenever the payment gateway is called, and in many cases the cart total doesn’t refresh when items are added or removed. • Product listings sporadically disappear or display the wrong price. • User-account pages load slowly, and profile edits sometimes don’t save. I’m looking for a developer who can dive straight into the codebase, trace the root causes, and deliver clean, tested fixes without disturbing the rest of the site. Once we agree on access details, you’ll have staging and production environments to work with as well as error-log snapshots I’ve collected. Acceptance criteria 1. Payments complete successfully in all major browsers; customers receive an order-confirmation email every time. 2. Cart totals update instantly on add/remove actions, including quantity adjustments. 3. Product grids pull the correct data and remain visible after cache clears. 4. User-account edits save reliably, and page speed returns to normal. 5. All corrections are documented so I can follow what changed. If you’re comfortable troubleshooting live e-commerce code and can wrap this up quickly, let’s talk.