Dart

Refresh QuickBooks OAuth2 Access Token

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Demonstrates how to refresh a QuickBooks OAuth2 access token. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  // See Get QuickBooks OAuth2 Access Token 
  // for sample code showing how to obtain a QuickBooks access token for desktop apps.

  // This example assumes we previously obtained an OAuth2 access token for QuickBooks.

  final jsonToken = CkJsonObject();
  try {
    jsonToken.loadFile('qa_data/tokens/qb-access-token.json');
  } on ChilkatException {
    print('Failed to load qb-access-token.json');
    return;
  }

  // The access token JSON looks something like this:

  // {
  //   "expires_in": 3600,
  //   "x_refresh_token_expires_in": 8726400,
  //   "refresh_token": "L011546037639r ... 3vR2DrbOmg0Sdagw",
  //   "access_token": "eyJlbmMiOiJBMTI4Q0 ... oETJEMbeggg",
  //   "token_type": "bearer"
  // }

  final oauth2 = CkOAuth2();

  oauth2.tokenEndpoint = 'https://oauth.platform.intuit.com/oauth2/v1/tokens/bearer';

  // Replace these with actual values.
  oauth2.clientId = 'QUICKBOOKS-CLIENT-ID';
  oauth2.clientSecret = 'QUICKBOOKS-CLIENT-SECRET';

  // Get the "refresh_token"
  oauth2.refreshToken = jsonToken.stringOf('refresh_token');

  // Send the HTTP POST to refresh the access token..
  try {
    oauth2.refreshAccessToken();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // The response contains a new access token, but we must keep
  // our existing refresh token for when we need to refresh again in the future.
  jsonToken.updateString('access_token', oauth2.accessToken);

  // Save the new JSON access token response to a file.
  // The access + refresh tokens contained in this JSON will be needed for the next refresh.
  final sbJson = CkStringBuilder();
  jsonToken.emitCompact = false;

  jsonToken.emitSb(sbJson);
  sbJson.writeFile('qa_data/tokens/qb-access-token.json', 'utf-8', false);

  print('OAuth2 token refreshed!');
  print('New Access Token = ${oauth2.accessToken}');
}