Retrieve a user by External User ID.
Get user by external user id with API key
1. Use 'Authorization' header to pass API key
2. As a result, the API returns a user with the specified external user id
ID of the user in the external system .
ApiKey {your_api_key}
. Must be used either QB-Token or Authorization.200
A successful response
401
An error response
403
An error response
422
An error response