public static function get_tickets_in_cart_for_provider( $provider = null ) {
			if ( null === $provider ) {
				$provider = tribe_get_request_var( 'provider', false );
			}

			/**
			 * Filter to add/remove tickets from the global cart.
			 *
			 * @since 4.9
			 * @since 4.11.0 Added $provider to allow context of current provider.
			 *
			 * @param array        $tickets_in_cart The array containing the cart elements. Format array( 'ticket_id' => 'quantity' ).
			 * @param string|false $provider        Current ticket provider or false if not set.
			 */
			return (array) apply_filters( 'tribe_tickets_tickets_in_cart', [], $provider );
		}