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Build a custom dropshipping order automation app for Shopify using Next.js, PostgreSQL, Prisma, and the Shopify App Remix Framework.

1. DATA MODEL:
Define Prisma schemas for Store, Supplier, ProductMapping, Order, and Fulfillment. ProductMapping must associate a Shopify Variant ID with a Supplier SKU, wholesale unit cost, and target shipping line. Order must track fulfillment status, upstream supplier order IDs, tracking numbers, and total supplier cost.

2. PRODUCT IMPORT & MAPPING:
Create an admin interface that accepts supplier catalog payloads (JSON/CSV) or custom supplier API endpoints. Allow merchants to import products directly to Shopify using the Shopify GraphQL Admin API (`productCreate`). Store the mapping relationship between the generated Shopify Variant ID and the upstream Supplier SKU.

3. ORDER ROUTING & AUTOMATION:
Set up a webhook handler for `orders/paid`. Parse incoming orders, filter for line items with stored Supplier SKUs, and insert them into the PostgreSQL database. Implement a background queue using BullMQ to dispatch purchase orders to the supplier API or generate formatted CSV dispatches for manual 3PL processing.

4. TRACKING SYNC:
Expose an API endpoint (`/api/fulfillment/update`) for incoming supplier webhooks or CSV tracking uploads. Upon receiving a valid tracking code, call Shopify's GraphQL API (`fulfillmentCreateV2`) to attach the tracking number, set the shipping carrier, and trigger the native Shopify customer shipping notification email.

5. ERROR HANDLING & RETRIES:
Implement error handling for failed API calls, Shopify rate-limiting backoffs, out-of-stock notices from suppliers, and price discrepancy flags where supplier wholesale cost exceeds the merchant's configured threshold.

OUT OF SCOPE: Physical sourcing, real-time freight carrier price negotiation, chargeback processing, and public supplier discovery directory.

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