public function get_event_key() {
			if ( property_exists( $this, 'event_key' ) ) {
				// EDD module uses a static event_key so we need to check for it or we'll fatal
				$prop = new ReflectionProperty( $this, 'event_key' );
				if ( $prop->isStatic() ) {
					return $prop->get_value();
				}

				return $this->event_key;
			}

			return '';
		}