installed plugin Easy Digital Downloads version 3.1.0.3

wp-content/plugins/easy-digital-downloads/includes/admin/discounts/discount-codes.php

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+<?php
+/**
+ * Discount Codes
+ *
+ * @package     EDD
+ * @subpackage  Admin/Discounts
+ * @copyright   Copyright (c) 2018, Easy Digital Downloads, LLC
+ * @license     http://opensource.org/licenses/gpl-2.0.php GNU Public License
+ * @since       1.0
+ */
+
+// Exit if accessed directly
+defined( 'ABSPATH' ) || exit;
+
+/**
+ * Renders the Discounts admin page.
+ *
+ * Here only for backwards compatibility
+ *
+ * @since 1.4
+ * @since 3.0 Nomenclature updated for consistency.
+*/
+function edd_discounts_page() {
+	// Enqueue scripts.
+	wp_enqueue_script( 'edd-admin-discounts' );
+
+	// Edit
+	if ( ! empty( $_GET['edd-action'] ) && ( 'edit_discount' === $_GET['edd-action'] ) ) {
+		wp_enqueue_script( 'edd-admin-notes' );
+		require_once EDD_PLUGIN_DIR . 'includes/admin/discounts/edit-discount.php';
+
+	// Add
+	} elseif ( ! empty( $_GET['edd-action'] ) && ( 'add_discount' === $_GET['edd-action'] ) ) {
+		require_once EDD_PLUGIN_DIR . 'includes/admin/discounts/add-discount.php';
+
+	// List tables
+	} else {
+		edd_adjustments_page();
+	}
+}
+
+/**
+ * Output the discounts page content, in the adjustments page action.
+ *
+ * @since 3.0
+ */
+function edd_discounts_page_content() {
+	require_once EDD_PLUGIN_DIR . 'includes/admin/discounts/class-discount-codes-table.php';
+
+	$discount_codes_table = new EDD_Discount_Codes_Table();
+	$discount_codes_table->prepare_items();
+
+	do_action( 'edd_discounts_page_top' ); ?>
+
+	<form id="edd-discounts-filter" method="get" action="<?php echo esc_url( edd_get_admin_url( array( 'page' => 'edd-discounts' ) ) ); ?>">
+		<?php $discount_codes_table->search_box( __( 'Search Discounts', 'easy-digital-downloads' ), 'edd-discounts' ); ?>
+
+		<input type="hidden" name="post_type" value="download" />
+		<input type="hidden" name="page" value="edd-discounts" />
+
+		<?php
+		$discount_codes_table->views();
+		$discount_codes_table->display();
+		?>
+	</form>
+
+	<?php do_action( 'edd_discounts_page_bottom' );
+}
+add_action( 'edd_adjustments_page_discount', 'edd_discounts_page_content' );