Crear y gestionar envíos internacionales

POST /v1/fulfillment/shipments/create {#create}

Los mismos campos principales que preview, más opcionales:

• external_shipment_id: clave de idempotencia
• remark

total.payment debe coincidir con el total de preview:

"total": {
  "freight": { "amount": 8900, "currency": "CNY" },
  "services": { "amount": 1500, "currency": "CNY" },
  "discount": { "amount": 200, "currency": "CNY" },
  "payment": { "amount": 10200, "currency": "CNY" }
}

Devuelve shipment_id y status (por ejemplo, wait_payment).

POST /v1/fulfillment/shipments/pay {#pay}

{
  "shipment_id": "shp_01HXYZ"
}

Carga la billetera de fulfillment. Saldo insuficiente → INSUFFICIENT_BALANCE.

POST /v1/fulfillment/shipments/cancel {#cancel}

{
  "shipment_id": "shp_01HXYZ",
  "cancel_reason": "buyer_request"
}

POST /v1/fulfillment/shipments/detail {#detail}

{
  "shipment_id": "shp_01HXYZ"
}