<?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="currency_display_options_forming">
        <observer name="change_currency" instance="Dinhvan\Store\Model\Observer\ChangeCurrency" />
    </event>
</config>
