---
title: "Connect a freight provider account"
method: POST
path: "/v2/freight/provider_accounts"
tags: ["freight"]
---

# Connect a freight provider account

`POST /v2/freight/provider_accounts`

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Connect a freight account the seller already holds with the provider. Both connectable providers — `speedship` (WWEX) and `unishippers` — authenticate with an OAuth client ID / secret pair issued by the provider.

The credentials are verified against the provider before they are stored, so a `201` means the connection can be quoted against immediately.

A seller may hold one connection per provider. Connecting a provider that is already connected returns `409` with error code `freight_provider_already_connected` and the existing `freight_provider_account_id`. Use `PUT /v2/freight/provider_accounts/{freight_provider_account_id}/credentials` to rotate credentials on the existing connection. Use `DELETE /v2/freight/provider_accounts/{freight_provider_account_id}` to disconnect it.

## Request body

- ConnectFreightProviderAccountRequestBody — A request to connect a freight account the seller already holds with a provider.
  - `freight_provider_code` string, required — The code of the provider to connect. The connectable codes are the `freight_provider_code` values returned by [List freight provider accounts](#operation/list_freight_provider_accounts). Currently supported: `speedship` (WWEX) and `unishippers`.
  - `client_id` string, required — The OAuth client ID issued by the freight provider.
  - `client_secret` string, required — The OAuth client secret issued by the freight provider.
  - `nickname` string, nullable — An optional label for the connection. Echoed back by [List freight provider accounts](#operation/list_freight_provider_accounts).

## Response `201`

The freight provider account was connected successfully.

- FreightProviderAccount — A freight provider account connected to your account.
  - `freight_provider_account_id` string — A string that uniquely identifies a ShipStation resource, such as a carrier, label, shipment, etc.
  - `freight_provider_code` string — The code of the freight provider, such as `UNISHIPPERS` or `WWEX`. This is the same value returned as `freight_provider_code` on quotes, shipments, and tracking.
  - `nickname` string, nullable — The name given to the connection when it was set up, or `null` when it has none.

## Other responses

- `400` — A required field is missing or invalid, or the `freight_provider_code` is not a supported value.
- `409` — The seller already has an active connection to this provider (`freight_provider_already_connected`). The error body includes the existing `freight_provider_account_id`.
- `500` — An error occurred on ShipStation API's side.

## Changes

- **2026-09-05** `17802d3fbe61` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/shipstation/apis/shipstation-api-v2/changes/v2/freight/provider_accounts/post.md)

---

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