Placing Order algorithm (Rest API not Controller)

Question

Which Controller (or php class) is actually responsible for placing an order?

Seems the following JS components are initiating the post request:

Checkout Page -> Payment Button

Magento_Checkout/js/view/payment/default.js
Magento_Checkout/js/action/place-order.js
Magento_Checkout/js/model/place-order.js

But I don't know what controller (or php class) is responsible for actually handling the placeOrder request.

Answer 1

Following class is responsible for placing order from checkout page

Magento\Quote\Model\QuoteManagement

Find placeOrder method.

How it call?

Open Magento/Checkout/view/frontend/web/js/action/place-order.js,

It's call 'carts/mine/payment-information' OR 'guest-carts/:quoteId/payment-information'

that means Magento/Checkout/Model/PaymentInformationManagement.php savePaymentInformationAndPlaceOrder method.

Check here