# Get access token using refresh token

Exchange a refresh token for a new access token. Use this to refresh an expired or
expiring access token without re-authenticating with username/password.
Optional service parameter (e.g. Teams, Webex) determines which user pool to use.

Endpoint: POST /auth/getaccesstoken
Version: 1.0.0
Security: BearerAuth

## Request fields (application/json):

  - `username` (string, required)
    User email address

  - `refreshToken` (string, required)
    JWT refresh token previously obtained from login

  - `service` (string)
    Service identifier (optional, e.g. Teams or Webex). Defaults to Teams if not provided.
    Example: "Teams"

## Response 200 fields (application/json):

  - `username` (string)
    Example: "test@email.com"

  - `accessToken` (string)
    Example: "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9..."

  - `refreshToken` (string)
    Example: "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9..."

  - `expirationTimeInUTC` (string)
    Example: "2024-02-29T15:09:14.242875589"

  - `roles` (array)
    Example: ["CSP_BUSINESS"]

  - `tenantId` (string)
    Example: "Sabrhub"

  - `services` (array)
    Example: ["Teams"]