Create uninstalling process

uninstall.php

@@ -0,0 +1,17 @@
+<?php
+/**
+ * Merchant Uninstall
+ */
+
+defined( 'WP_UNINSTALL_PLUGIN' ) || exit;
+
+global $wpdb, $wp_version;
+
+/*
+ * Only remove ALL merchant & merchant-pro data if WC_REMOVE_ALL_DATA constant is set to true in user's
+ * wp-config.php. This is to prevent data loss when deleting the plugin from the backend
+ * and to ensure only the site owner can perform this action. (Copied from WooCommerce).
+ */
+if ( defined( 'WC_REMOVE_ALL_DATA' ) && true === WC_REMOVE_ALL_DATA ) {
+	$wpdb->query( $wpdb->prepare( "DROP TABLE IF EXISTS %s", $wpdb->prefix . 'merchant_sales_notifications' ) );
+}