My Shopify auto-parts store is live except for one blocker: when customers reach checkout they’re told we can’t ship to their address. I run inventory through three different warehouses/wholesalers, so the issue looks tied to how shipping zones and rates are configured across those locations—essentially a backend configuration issue. Here’s what I need: • Diagnose and correct the shipping logic so every product can calculate a valid rate, whether the order is fulfilled from one or several of the three warehouses. • Set up reliable carrier, price-based, or weight-based rules only if truly required; the main goal is simply to make checkout work. • Tidy up any related database management tasks, including a light data migration if rate tables or location records must be reorganised. Make sure all products can be checked out by customers. Check YMM mappings. • Leave clear, step-by-step notes so I can adjust or add upon additional supplier imports or if I an Aero Theme later without breaking what you implement. For an additional rate, I could have you set it up. I’ll grant full Shopify admin access plus any wholesaler credentials you require. Once customers can complete an order from any vendor, end-to-end, without the “can’t ship to that address” error, the job is pretty much done.