code: public function execute($request)
      {
          RequestNotSupportedException::assertSupports($this, $request);
  
          /** @var PaymentInterface $payment */
          $payment = $request->getSource();
  
          $details = ArrayObject::ensureArrayObject($payment->getDetails());
  
          if (isset($details[Constants::FIELD_STATUS])) {
              return;
          }
  
          if (null === $sale = $payment->getSale()) {
              throw new RuntimeException("Payment's sale must be defined at this point.");
          }
          if (null === $customer = $sale->getCustomer()) {
              throw new RuntimeException("Sale's customer must be defined at this point.");
          }
  
          $details->defaults(array(
              Constants::FIELD_STATUS  => null,
              Constants::FIELD_AMOUNT  => $payment->getAmount(),
              Constants::FIELD_BALANCE => $customer->getCreditBalance(),
          ));
  
          $request->setResult((array) $details);
      }
docs: {@inheritDoc}
  
  @param Convert $request