public function update_capacity( $ticket, $data, $save_type ) {
			if ( empty( $data ) ) {
				return;
			}

			// set the default capacity to that of the event, if set, or to unlimited
			$default_capacity = (int) Tribe__Utils__Array::get( $data, 'event_capacity', -1 );

			// Fetch capacity field, if we don't have it use default (defined above)
			$data['capacity'] = trim( Tribe__Utils__Array::get( $data, 'capacity', $default_capacity ) );

			// If empty we need to modify to the default
			if ( '' === $data['capacity'] ) {
				$data['capacity'] = $default_capacity;
			}

			// The only available value lower than zero is -1 which is unlimited
			if ( 0 > $data['capacity'] ) {
				$data['capacity'] = -1;
			}

			// Fetch the stock if defined, otherwise use Capacity field
			$data['stock'] = trim( Tribe__Utils__Array::get( $data, 'stock', $data['capacity'] ) );

			// If empty we need to modify to what every capacity was
			if ( '' === $data['stock'] ) {
				$data['stock'] = $data['capacity'];
			}

			// The only available value lower than zero is -1 which is unlimited
			if ( 0 > $data['stock'] ) {
				$data['stock'] = -1;
			}

			if ( -1 !== $data['capacity'] ) {
				if ( 'update' === $save_type ) {
					/** @var Tribe__Tickets__Tickets_Handler $tickets_handler */
					$tickets_handler = tribe( 'tickets.handler' );

					$totals = $tickets_handler->get_ticket_totals( $ticket->ID );

					$data['stock'] -= $totals['pending'] + $totals['sold'];
				}

				update_post_meta( $ticket->ID, '_manage_stock', 'yes' );
				update_post_meta( $ticket->ID, '_stock', $data['stock'] );
			} else {
				// unlimited stock
				delete_post_meta( $ticket->ID, '_stock_status' );
				update_post_meta( $ticket->ID, '_manage_stock', 'no' );
				delete_post_meta( $ticket->ID, '_stock' );
				delete_post_meta( $ticket->ID, Tribe__Tickets__Global_Stock::TICKET_STOCK_MODE );
				delete_post_meta( $ticket->ID, Tribe__Tickets__Global_Stock::TICKET_STOCK_CAP );
			}

			tribe_tickets_update_capacity( $ticket, $data['capacity'] );
		}