toString method
A string representation of this object.
Some classes have a default textual representation,
often paired with a static parse function (like int.parse).
These classes will provide the textual representation as
their string representation.
Other classes have no meaningful textual representation
that a program will care about.
Such classes will typically override toString to provide
useful information when inspecting the object,
mainly for debugging or logging.
Implementation
@override
String toString() {
  final $buf = StringBuffer()..writeln('AuthorizationVerificationData(');
  if (addressLine1Check != null) {
    $buf
      ..writeln()
      ..write('  address_line1_check: ')
      ..write(addressLine1Check)
      ..write(',');
  }
  if (addressPostalCodeCheck != null) {
    $buf
      ..writeln()
      ..write('  address_postal_code_check: ')
      ..write(addressPostalCodeCheck)
      ..write(',');
  }
  if (authenticationExemption != null) {
    $buf
      ..writeln()
      ..write('  authentication_exemption: ')
      ..write(authenticationExemption)
      ..write(',');
  }
  if (cvcCheck != null) {
    $buf
      ..writeln()
      ..write('  cvc_check: ')
      ..write(cvcCheck)
      ..write(',');
  }
  if (expiryCheck != null) {
    $buf
      ..writeln()
      ..write('  expiry_check: ')
      ..write(expiryCheck)
      ..write(',');
  }
  if (threeDSecure != null) {
    $buf
      ..writeln()
      ..write('  three_d_secure: ')
      ..write(threeDSecure)
      ..write(',');
  }
  $buf.write(')');
  return $buf.toString();
}