+function custom_woo_ce_orders_filter_by_custom_meta() {

+add_action( 'woo_ce_export_order_options_before_table', 'custom_woo_ce_orders_filter_by_custom_meta', 11 );

+	if( !empty( $custom_meta ) ) {

+function woo_ce_orders_filter_by_custom_meta() {

+

+	// This is the Order meta key we want to filter Orders by

+	$meta_key = '_shipping_postcode';

+

+	ob_start(); ?>

+<p><label id="order_filter_custom_meta"><?php printf( __( 'Filter Orders by %s', 'woocommerce-exporter' ), $meta_key ); ?></label></p>

+<div id="export-orders-filters-custom_meta" class="separator">

+	<ul>

+		<li>

+			<input type="text" id="order_filter_custom_meta" name="order_filter_custom_meta" />

+		</li>

+	</ul>

+</div>

+<!-- #export-orders-filters-custom_meta -->

+<?php

+	ob_end_flush();

+

+}

+add_action( 'woo_ce_export_order_options_before_table', 'woo_ce_orders_filter_by_custom_meta', 11 );

+

+function custom_woo_ce_get_orders_args( $args ) {

+

+	// This is the Order meta key we want to filter Orders by

+	$meta_key = '_shipping_postcode';

+

+	// This is the Order meta value we will pass to WP_Query to return the filtered Orders

+	$custom_meta = ( isset( $_POST['order_filter_custom_meta'] ) ? sanitize_text_field( $_POST['order_filter_custom_meta'] ) : false );

+

+	if( $custom_meta !== false ) {

+

+		// Check if $args['meta_query'] exists

+		if( !isset( $args['meta_query'] ) )

+			$args['meta_query'] = array();

+

+		// Add our custom meta

+		$args['meta_query'][] = array(

+			'key' => $meta_key,

+			'value' => $custom_meta

+		);

+

+	}

+	return $args;

+

+}

+add_filter( 'woo_ce_get_orders_args', 'custom_woo_ce_get_orders_args' );