# Issue an OAuth 2.0 access token

Endpoint: POST /oauth2/token
Version: 1.0.0
Security: Biller Access Token (Production), Biller Access Token (Staging)

## Header parameters:

  - `Authorization` (string)
    The authorization header

## Query parameters:

  - `grant_type` (string, required)

  - `client_id` (string)

  - `client_secret` (string)

  - `code` (string)

  - `refresh_token` (string)

  - `redirect_uri` (string)

  - `scope` (array)


## Response 200 fields