Calculate a guaranteed landed cost quote for an international order using the Zonos Landed Cost GraphQL API

Steps

1. Build the required GraphQL inputs: partyCreateWorkflowInput for shipping parties, and itemCreateWorkflowInput for each item's amount, currencyCode, quantity, countryOfOrigin, and a productId or sku.
2. Decide how to supply HS codes: pass a product-specific hsCode per item for the most accurate duty calculation, or omit it and let Zonos check its Catalog and then fall back to Classify (using description, category, and material) to auto-generate one.
3. Provide shipping cost either via shipmentRatingCreateWorkflowInput (you already know the service level and amount) or shipmentRatingCalculateWorkflowInput (have Zonos calculate it from your configured shipping profiles).
4. Set landedCostWorkFlowInput fields: calculationMethod (use DDP_PREFERRED for a guaranteed quote), endUse (FOR_RESALE vs NOT_FOR_RESALE), and tariffRate (use ZONOS_PREFERRED for a guaranteed quote).
5. Send the landedCostCalculateWorkflow GraphQL mutation and parse the returned duties, taxes, and fees breakdown, each with amount, currency, and note.
6. After receiving the landedCostId from the response, call the orderCreate mutation with that ID to finalize the order in Zonos if Zonos is also processing the transaction.