# Authenticate Using External Id

**POST /auth/external-id**

Authenticates using the partner's External Id and Shared Key, and returns a Context Id.


## Servers
- Production: https://ws.zipformplus.com/api (Production)
- Staging/QA: https://api.pre.zipformplus.com/api (Staging/QA)



## Parameters



### Body: application/json (object)

- **SharedKey** (string)

- **ExternalId** (string)



## Responses
### 200
Authentication successful

#### Body: application/json (object)
- **contextId** (string)
  Session identifier to be used in subsequent requests


### 401
Unauthorized


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