Can I vibe code Sendcloud?

Build a multi-carrier shipping label generator and tracking system in Node.js and React.

DATA MODELS:
- Merchant: id, name, shopify_store_url, api_key.
- CarrierContract: id, merchant_id, carrier_code (dhl_de, postnl, dpd_uk), account_number, api_credentials (encrypted JSON).
- Order: id, external_order_id, recipient_address (JSON: name, street1, street2, city, postal_code, country_code, phone), line_items (JSON: SKU, title, weight_grams, hs_code, value, quantity).
- Shipment: id, order_id, carrier_code, service_level, tracking_number, status (created, picked_up, in_transit, delivered, exception), label_url, zpl_data, customs_doc_url, weight_grams.

INTEGRATIONS & APIS:
1. Shopify Admin API: Webhook receivers for `orders/created`. Map incoming orders to internal Order model. Write back fulfillment tracking number and carrier URL using `fulfillmentCreateV2`.
2. Multi-Carrier API Wrapper (Use Karrio API or simulate PostNL/DHL REST endpoints):
   - Create a unified POST `/api/shipments/generate` endpoint.
   - Accept parcel dimensions, weight, address, and selected carrier service.
   - Request label generation from carrier API.
   - Parse returned PDF/ZPL raw base64 data and upload to local storage or S3 bucket.
3. Customs Engine: If `recipient_address.country_code` is outside the merchant's origin EU country, generate CN22/CN23 payload with line-item HS codes and country of origin.
4. Tracking Webhooks: POST `/api/webhooks/carrier-status` to receive status updates from carriers. Update shipment status and send transactional email (SendGrid API) with branded tracking link.

CLIENT DASHBOARD (Next.js / Tailwind):
- Order Queue view showing pending unfulfilled Shopify orders.
- One-click bulk label generation: selectable check-boxes for orders, automated carrier routing based on weight (e.g. <2kg = Royal Mail, >2kg = DPD), and batch PDF creation.
- Thermal Print helper: API trigger that outputs raw ZPL strings directly to browser or local CUPS server.
- Public Branded Tracking Page route `/tracking/[tracking_number]` rendering parcel history step-by-step UI.

FAILURE MODES TO HANDLE:
- Address validation failures: catch invalid postal codes before calling carrier APIs and surface inline form editor.
- Carrier timeout: implement retry logic with exponential backoff for carrier REST calls.
- Missing HS codes for international parcels: block label creation and highlight missing fields in UI.

OUT OF SCOPE:
- Native checkout service point map pickers.
- Rate shopping against Sendcloud's aggregated carrier accounts.
- Automated carrier insurance claim management.

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