---
title: "Validate external order"
method: POST
path: "/open-api/v1.0/external-orders/validate"
tags: ["External Orders"]
---

# Validate external order

`POST /open-api/v1.0/external-orders/validate`

*Rate limit: 100 requests / 10 seconds per shop. See [Rate limiting](/guides/rate-limiting).*

Validate order details and preview costs before creating. Use this endpoint to verify offer availability, calculate estimated costs, and check shipping feasibility before creating an external order.

## Request body

- ComFourthwallOpenapiModelValidateExternalOrderRequest
  - `items` ComFourthwallOpenapiModelExternalOrderItemRequest[], required
    - `variantId` string, required
    - `quantity` string, required
  - `shippingAddress` ComFourthwallOpenapiModelExternalOrderAddressRequest, required
    - `firstName` string, required
    - `lastName` string, required
    - `address1` string, required
    - `address2` string
    - `city` string, required
    - `state` string
    - `zip` string, required
    - `country` string, required
    - `phone` string

## Response `200`

OK

- ComFourthwallOpenapiModelValidateExternalOrderResponse
  - `valid` boolean, required
  - `errors` ComFourthwallOpenapiModelValidationErrorDto[]
    - `code` string, required
    - `field` string, required
    - `message` string, required
  - `estimatedCosts` ComFourthwallOpenapiModelExternalOrderCostsV1
    - `fulfillmentFee` Money, required
      - `value` number, required
      - `currency` string, required
    - `manufacturingCost` Money, required
      - `value` number, required
      - `currency` string, required
    - `shippingCost` Money, required
      - `value` number, required
      - `currency` string, required
    - `totalCreatorCost` Money, required
      - `value` number, required
      - `currency` string, required
  - `estimatedDelivery` ComFourthwallOpenapiModelDeliveryEstimateDto
    - `minDate` string, date, required
    - `maxDate` string, date, required

## Other responses

- `400` — Possible errors: `EXTERNAL_ORDER_COUNTRY_NOT_SUPPORTED`, `EXTERNAL_ORDER_VARIANT_NOT_FOUND`, `SHIPPING_RATES_ERROR`, `UNSUPPORTED_OPERATION_FOR_MANUFACTURER`
- `404` — Possible errors: `CHECKOUT_SHOP_NOT_FOUND_ERROR`, `DELIVERY_SHOP_NOT_FOUND_ERROR`, `OFFER_NOT_FOUND_ERROR`, `OFFER_VARIANT_NOT_FOUND_ERROR`, `PRODUCT_CATALOG_PRODUCT_ID_NOT_FOUND`, `SHOP_TEAM_MEMBER_SHOP_NOT_FOUND_ERROR`
- `422` — Possible errors: `FULFILLMENT_ILLEGAL_STATE_ERROR`
- `429` — Rate limited: 100 requests / 10 seconds per shop.

---

[API](https://skmtc.net/fourthwall/apis/fourthwall-apis-2.md) · [All operations](https://skmtc.net/fourthwall/apis/fourthwall-apis-2/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/fourthwall/fourthwall-apis-2/revisions/ef273312f051/schema)