validateCVV static method

String? validateCVV(
  1. String? value
)

Implementation

static String? validateCVV(String? value) {
  if (value!.isEmpty) {
    return Strings.fieldReq;
  }

  if (value.length < 3 || value.length > 4) {
    return "CVV is invalid";
  }
  return null;
}