const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    grantType: 'authorization_code',
    code: '<string>',
    refreshToken: '<string>',
    clientId: '<string>',
    clientSecret: '<string>',
    redirectUri: '<string>'
  })
};

fetch('https://api.example.com/v1/regions/global/auth/tokens', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "success": true,
  "data": {
    "accessToken": "<string>",
    "tokenType": "Bearer",
    "expiresIn": 123,
    "refreshToken": "<string>",
    "idToken": "<string>",
    "scope": "<string>"
  }
}