curl --request POST \
  --url https://api.tassyir.io/apps/oauth/token \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --data grant_type=urn:ietf:params:oauth:grant-type:token-exchange \
  --data 'subject_token=<string>' \
  --data subject_token_type=urn:ietf:params:oauth:token-type:id_token \
  --data requested_token_type=urn:tassyir:params:oauth:token-type:offline-access-token \
  --data 'client_id=<string>'

const options = {
  method: 'POST',
  headers: {
    Authorization: 'Basic <encoded-value>',
    'Content-Type': 'application/x-www-form-urlencoded'
  },
  body: new URLSearchParams({
    grant_type: 'urn:ietf:params:oauth:grant-type:token-exchange',
    subject_token: '<string>',
    subject_token_type: 'urn:ietf:params:oauth:token-type:id_token',
    requested_token_type: 'urn:tassyir:params:oauth:token-type:offline-access-token',
    client_id: '<string>'
  })
};

fetch('https://api.tassyir.io/apps/oauth/token', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "access_token": "<string>",
  "token_type": "Bearer",
  "expires_in": 123,
  "scope": "<string>",
  "installation_id": "<string>",
  "business_id": "<string>",
  "refresh_token": "<string>",
  "refresh_token_expires_in": 123,
  "issued_token_type": "urn:tassyir:params:oauth:token-type:offline-access-token",
  "user_id": "<string>"
}

{
  "error": "invalid_grant",
  "error_description": "<string>"
}

{
  "error": "invalid_client",
  "error_description": "<string>"
}

{
  "error": "invalid_request",
  "error_description": "<string>"
}

{
  "error": "slow_down",
  "error_description": "<string>"
}

{
  "statusCode": 123,
  "message": "<string>",
  "requestId": "<string>"
}

{
  "error": "temporarily_unavailable",
  "error_description": "<string>"
}