public static function json_search_customers() {
		ob_start();

		check_ajax_referer( 'search-customers', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) ) {
			wp_die( -1 );
		}

		$term  = isset( $_GET['term'] ) ? (string) wc_clean( wp_unslash( $_GET['term'] ) ) : '';
		$limit = 0;

		if ( empty( $term ) ) {
			wp_die();
		}

		$ids = array();
		// Search by ID.
		if ( is_numeric( $term ) ) {
			$customer = new WC_Customer( intval( $term ) );

			// Customer does not exists.
			if ( 0 !== $customer->get_id() ) {
				$ids = array( $customer->get_id() );
			}
		}

		// Usernames can be numeric so we first check that no users was found by ID before searching for numeric username, this prevents performance issues with ID lookups.
		if ( empty( $ids ) ) {
			$data_store = WC_Data_Store::load( 'customer' );

			// If search is smaller than 3 characters, limit result set to avoid
			// too many rows being returned.
			if ( 3 > strlen( $term ) ) {
				$limit = 20;
			}
			$ids = $data_store->search_customers( $term, $limit );
		}

		$found_customers = array();

		if ( ! empty( $_GET['exclude'] ) ) {
			$ids = array_diff( $ids, array_map( 'absint', (array) wp_unslash( $_GET['exclude'] ) ) );
		}

		foreach ( $ids as $id ) {
			$customer = new WC_Customer( $id );
			/* translators: 1: user display name 2: user ID 3: user email */
			$found_customers[ $id ] = sprintf(
				/* translators: $1: customer name, $2 customer id, $3: customer email */
				esc_html__( '%1$s (#%2$s – %3$s)', 'woocommerce' ),
				$customer->get_first_name() . ' ' . $customer->get_last_name(),
				$customer->get_id(),
				$customer->get_email()
			);
		}

		wp_send_json( apply_filters( 'woocommerce_json_search_found_customers', $found_customers ) );
	}