<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="checkout_cart_add_product_complete">
        <observer name="save_item_id" instance="Custom\DaysConfig\Observer\SaveItemId" />
    </event>

    <event name="checkout_onepage_controller_success_action">
        <observer name="custom_daysconfig_checkout_submit_all_after" instance="Custom\DaysConfig\Observer\ProcessOrder" />
    </event>
</config>