generatePaymentId function

Implementation

String generatePaymentId({int length = 20}) {
  const characters =
      'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
  final random = Random();
  return String.fromCharCodes(Iterable.generate(
    length,
    (_) => characters.codeUnitAt(random.nextInt(characters.length)),
  ));
}