Dart

PayPal -- Get an OAuth 2.0 Access Token

See more PayPal Examples

Demonstrates how to send a request to get a PayPal OAuth2 access token. Sends an HTTP request equivalent to the following:

curl https://api.sandbox.paypal.com/v1/oauth2/token \
  -H "Accept: application/json" \
  -H "Accept-Language: en_US" \
  -u "Client-Id:Secret" \
  -d "grant_type=client_credentials"

Dart

import 'package:chilkat/chilkat.dart';

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

  final rest = CkRest();

  // Make the initial connection.
  // A single REST object, once connected, can be used for many PayPal REST API calls.
  // The auto-reconnect indicates that if the already-established HTTPS connection is closed,
  // then it will be automatically re-established as needed.
  final bAutoReconnect = true;
  try {
    rest.connect('api.sandbox.paypal.com', 443, true, bAutoReconnect);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Duplicate this request:

  // 	curl https://api.sandbox.paypal.com/v1/oauth2/token \
  // 	  -H "Accept: application/json" \
  // 	  -H "Accept-Language: en_US" \
  // 	  -u "Client-Id:Secret" \
  // 	  -d "grant_type=client_credentials"

  rest.addHeader('Accept', 'application/json');
  rest.addHeader('Accept-Language', 'en_US');

  // For additional help on where to find  your client ID and API secret, see PayPal Client_ID and API_Secret
  rest.setAuthBasic('PAYPAL_REST_API_CLIENT_ID', 'PAYPAL_REST_API_SECRET');

  rest.addQueryParam('grant_type', 'client_credentials');

  final String responseStr;
  try {
    responseStr = rest.fullRequestFormUrlEncoded('POST', '/v1/oauth2/token');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print(rest.lastRequestHeader);

  // A sample response:

  // 	{
  // 	  "scope": "https://api.paypal.com/v1/payments/.* https://api.paypal.com/v1/vault/credit-card https://api.paypal.com/v1/vault/credit-card/.*",
  // 	  "access_token": "EEwJ6tF9x5WCIZDYzyZGaz6Khbw7raYRIBV_WxVvgmsG",
  // 	  "token_type": "Bearer",
  // 	  "app_id": "APP-6XR95014BA15863X",
  // 	  "expires_in": 28800
  // 	}

  final json = CkJsonObject();
  json.load(responseStr);
  json.emitCompact = false;

  // Check the response status code.  A 200 indicates success..
  if (rest.responseStatusCode != 200) {
    print(json.emit());
    print('Failed.');
    return;
  }

  // Given that the access token expires in approx 8 hours,
  // let's record the date/time this token was created.
  // This will allow us to know beforehand if the token
  // is expired (and we can then fetch a new token).
  final dateTime = CkDateTime();
  final bLocalTime = false;
  final dtNow = dateTime.getAsUnixTime(bLocalTime);
  json.appendInt('tokenCreateTimeUtc', dtNow);

  // Examine the access token and save to a file.
  print('Access Token: ${json.stringOf('access_token')}');
  print('Full JSON Response:');
  print(json.emit());

  final sbResponse = CkStringBuilder();
  sbResponse.append(json.emit());
  final bEmitBom = false;
  sbResponse.writeFile('qa_data/tokens/paypal.json', 'utf-8', bEmitBom);
}