validate method

@override void validate()

Implementation

@override
void validate() {
  if (plans.isEmpty && amount == null) {
    throw InvalidPaymentBodyException('Either plan or amount is required');
  }
  for (var plan in plans) {
    plan.validate();
    if (amount == null && plan.amount == null) {
      throw InvalidPaymentBodyException(
          'If no overall amount is provided every plan needs an amount');
    }
  }
  unplanned?.validate();
}