Use an integration level that matches your operation. Spreadsheet imports are often the quickest way to validate a workflow. An API is useful once fields, routing logic and exception ownership are stable.
Before choosing the integration method, map the full fulfillment warehouse label workflow: order validation, routing, label storage, printing, carrier handoff and exception records.
Spreadsheet workflow
- Use an agreed template and units.
- Validate required fields, weight and dimensions before creation.
- Return labels and separate row-level errors.
- Start with representative test orders.
API preparation
- Document the WMS, ERP or label system calling the service.
- Agree on authentication, fields, carrier codes, label files and error responses.
- Implement idempotency, retry behavior and duplicate-label protection.
- Keep logs that support billing, return and claim investigations.
Never send production credentials or real recipient data through the initial inquiry form.