private function parse_engagement( $engagement, $trigger_data ) {

		$parsed = array(
			'handler_action' => null,
			'handler_args'   => null,
		);

		/**
		 * Enable 3rd parties to parse custom engagement types.
		 *
		 * @since 2.3.0
		 *
		 * @param array $parsed {
		 *     An associative array of parsed data used to trigger the engagement.
		 *
		 *     @type string $handler_action (Required) Hook name of the action that will handle awarding the sending the engagement.
		 *     @type array  $handler_args   (Required) Arguments passed to the `$handler_action` callback.
		 * }
		 * @param object $engagement      The engagement object from the `get_engagements()` query.
		 * @param int    $user_id         WP_User ID who will be awarded the engagement.
		 * @param int    $related_post_id WP_Post ID of the related post.
		 * @param string $event_type      The type of engagement event.
		 */
		$filtered_parsed = apply_filters(
			'lifterlms_external_engagement_handler_arguments',
			$parsed,
			$engagement,
			$trigger_data['user_id'],
			$trigger_data['related_post_id'],
			$engagement->event_type
		);
		// If valid, return the filtered parsed data.
		if ( isset( $filtered_parsed['handler_action'] ) && isset( $filtered_parsed['handler_args'] ) ) {
			return $filtered_parsed;
		}

		// Verify that the engagement event type is supported.
		if ( ! array_key_exists( $engagement->event_type, llms_get_engagement_types() ) ) {
			return $parsed;
		}

		$parsed['handler_args'] = array(
			$trigger_data['user_id'],
			$engagement->engagement_id,
			$trigger_data['related_post_id'],
			absint( $engagement->trigger_id ),
		);

		/**
		 * @todo Fix this
		 *
		 * If there's no related post id we have to send one anyway for certs to work.
		 *
		 * This would only be for registration events @ version 2.3.0 so we pass the engagement_id twice until we find a better solution.
		 */
		if ( 'certificate' === $engagement->event_type && empty( $parsed['handler_args'][2] ) ) {
			$parsed['handler_args'][2] = $parsed['handler_args'][1];
		}

		$parsed['handler_action'] = sprintf(
			'lifterlms_engagement_%1$s_%2$s',
			'email' === $engagement->event_type ? 'send' : 'award',
			$engagement->event_type
		);

		return $parsed;

	}