public function get_handler_slug() {
		/**
		 * Filters which PayPal payment method should be used.
		 *
		 * @since 4.7
		 *
		 * @param string $handler One of `pdt` or `ipn`
		 */
		$handler = apply_filters( 'tribe_tickets_commerce_paypal_handler', 'ipn' );

		$handler = in_array( $handler, array( 'pdt', 'ipn' ) ) ? $handler : 'ipn';

		return $handler;
	}