code: public function getClassProperties()
      {
          return [
              'reference_number' => $this->getReferenceNumber(),
              'instruction_type' => $this->getInstructionType(),
              'bank_name' => $this->getBankName(),
              'account_holder_name' => $this->getAccountHolderName(),
              'international_bank_account_number' => $this->getInternationalBankAccountNumber(),
              'bank_identifier_code' => $this->getBankIdentifierCode(),
              'amountValue' => $this->getAmountValue(),
              'amount_currency' => $this->getAmountCurrency(),
              'payment_due_date' => $this->getPaymentDueDate(),
          ];
      }
docs: {@inheritdoc}