# Access Token

**POST /auth/sign_in.json**

Retrieve an access token to authenticate future requests. Multi-factor authentication (MFA) is required for all users; include the MFA token in the request.

Then send the token on later requests with header `X-TGP-ACCESS-TOKEN` (or parameter `access_token`).

You can also view your access token in Textline under Settings → Tools & Integrations → Developer API.


## Servers
- Production: https://application.textline.com (Production)



## Parameters



### Body: application/json (object)

- **user** (object)

- **api_key** (string)

- **mfa_code** (string)



## Responses
### 200
OK

#### Body: application/json (object)
- **mfa_verification_required** (string)

- **email** (string)

- **delivery_method** (string)

- **alternate_methods** (object)



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