/// for dart standalone project usage
import 'package:paymongo_sdk/paymongo_sdk.dart'

void main() async {
    /// apiKey can be either public key or secret key.
    /// but do not use secret key in your front-end.
    
    final publicSDK = PaymongoClient<PaymongoPublic>(apiKey);
    final data = SourceAttributes(
    type: 'gcash',
    amount: amount,
    currency: 'PHP',
    redirect: const Redirect(
        success: "https://google.com/success",
        failed: "https://google.com/failed",
    ),
    billing: billing,
    );

    final result = await publicSDK.instance.source.create(data);
}