How is \Magento\Sales\Model\Order\Payment::_void() implemented and used?

Development Payment
,
1

Implementation

981d1f/app/code/Magento/Sales/Model/Order/Payment.php#L1057-L1115

/**
 * Void payment either online or offline (process void notification)
 * NOTE: that in some cases authorization can be voided after a capture. In such case it makes sense to use
 *       the amount void amount, for informational purposes.
 * Updates payment totals, updates order status and adds proper comments
 *
 * @param bool $isOnline
 * @param float $amount
 * @param string $gatewayCallback
 * @return $this
 * @SuppressWarnings(PHPMD.CyclomaticComplexity)
 * @SuppressWarnings(PHPMD.NPathComplexity)
 */
protected function _void($isOnline, $amount = null, $gatewayCallback = 'void')
{
	$order = $this->getOrder();
	$authTransaction = $this->getAuthorizationTransaction();
	$this->setTransactionId(
		$this->transactionManager->generateTransactionId($this, Transaction::TYPE_VOID, $authTransaction)
	);
	$this->setShouldCloseParentTransaction(true);

	// attempt to void
	if ($isOnline) {
		$method = $this->getMethodInstance();
		$method->setStore($order->getStoreId());
		$method->{$gatewayCallback}($this);
	}
	if ($this->checkIfTransactionExists()) {
		return $this;
	}

	// if the authorization was untouched, we may assume voided amount = order grand total
	// but only if the payment auth amount equals to order grand total
	if ($authTransaction &&
		$order->getBaseGrandTotal() == $this->getBaseAmountAuthorized() &&
		0 == $this->getBaseAmountCanceled()
	) {
		if ($authTransaction->canVoidAuthorizationCompletely()) {
			$amount = (double)$order->getBaseGrandTotal();
		}
	}

	if ($amount) {
		$amount = $this->formatAmount($amount);
	}

	// update transactions, order state and add comments
	$transaction = $this->addTransaction(Transaction::TYPE_VOID, null, true);
	$message = $this->hasMessage() ? $this->getMessage() : __('Voided authorization.');
	$message = $this->prependMessage($message);
	if ($amount) {
		$message .= ' ' . __('Amount: %1.', $this->formatPrice($amount));
	}
	$message = $this->_appendTransactionToMessage($transaction, $message);
	$this->setOrderStateProcessing($message);
	$order->setDataChanges(true);
	return $this;
}

Details: How does \Magento\Sales\Model\Order\Payment::_void() work?

Usages

1. \Magento\Sales\Model\Order\Payment::registerVoidNotification()

2. \Magento\Sales\Model\Order\Payment::cancel()

Details: How is \Magento\Sales\Model\Order\Payment::cancel() implemented and used?