How to Perform Invoice Capture in Magento2 Programmatically

Question

How to capture payment for the created invoice. In Magento1.x it is like

$invoice = Mage::getModel('sales/Service_Order', $this->getOrder())->prepareInvoice();
$invoice->setRequestedCaptureCase(Mage_Sales_Model_Order_Invoice::CAPTURE_ONLINE);
$invoice->register();

I have the order increment id which has order status pending. Invoice needs to be generated for that order by loading increment id and do invoice capture operation. I am expecting the invoice capture operation will set transaction id(Ex. 2121) and move the order status to completed

Answer 1

It's pretty similar to M1 in Magento 2, you need to inject the Magento\Sales\Model\Service\InvoiceService in your class:

protected $_invoiceService;

public function __construct(
    ...
    \Magento\Sales\Model\Service\InvoiceService $invoiceService
    ...
) {
    ...
    $this->_invoiceService = $invoiceService;
    ...
}

Then, assuming you have the order you can do:

$invoice = $this->_invoiceService->prepareInvoice($order);
$invoice->setRequestedCaptureCase(\Magento\Sales\Model\Order\Invoice::CAPTURE_ONLINE);
$invoice->register();

To set a transaction ID on an invoice you can simply call setTransactionId() method on the invoice object.