public function define_trigger() {

		$args = [
			'post_type'      => 'forum',
			'posts_per_page' => 999,
			'orderby'        => 'title',
			'order'          => 'ASC',
			'post_status'    => [ 'publish', 'private' ],
		];
		$options               = Automator()->helpers->recipe->options->wp_query( $args, true, __( 'Any forum', 'uncanny-automator' ) );
		$forum_relevant_tokens = [
			'BDBFORUMS'     => __( 'Forum title', 'uncanny-automator' ),
			'BDBFORUMS_ID'  => __( 'Forum ID', 'uncanny-automator' ),
			'BDBFORUMS_URL' => __( 'Forum URL', 'uncanny-automator' ),
		];
		$relevant_tokens = [
			$this->trigger_meta          => __( 'Topic title', 'uncanny-automator' ),
			$this->trigger_meta . '_ID'  => __( 'Topic ID', 'uncanny-automator' ),
			$this->trigger_meta . '_URL' => __( 'Topic URL', 'uncanny-automator' ),
		];
		$trigger = array(
			'author'              => Automator()->get_author_name( $this->trigger_code ),
			'support_link'        => Automator()->get_author_support_link( $this->trigger_code, 'integration/buddyboss/' ),
			'integration'         => self::$integration,
			'code'                => $this->trigger_code,
			/* translators: Logged-in trigger - bbPress */
			'sentence'            => sprintf( __( 'A user replies to {{a topic:%1$s}} in {{a forum:%2$s}}', 'uncanny-automator' ), $this->trigger_meta, 'BDBFORUMS' ),
			/* translators: Logged-in trigger - bbPress */
			'select_option_name'  => __( 'A user replies to {{a topic}} in {{a forum}}', 'uncanny-automator' ),
			'action'              => 'bbp_new_reply',
			'priority'            => 10,
			'accepted_args'       => 3,
			'validation_function' => array( $this, 'bbp_insert_reply' ),
			'options_group'       => [
				$this->trigger_meta => [
					Automator()->helpers->recipe->field->select_field_ajax(
						'BDBFORUMS',
						__( 'Forum', 'uncanny-automator' ),
						$options,
						'',
						'',
						false,
						true,
						[
							'target_field' => $this->trigger_meta,
							'endpoint'     => 'select_topic_from_forum_BDBTOPICREPLY',
						],
						$forum_relevant_tokens
					),
					Automator()->helpers->recipe->field->select_field( $this->trigger_meta, __( 'Topic', 'uncanny-automator' ), array(), false, false, false, $relevant_tokens ),
				],
			],
		);
		Automator()->register->trigger( $trigger );
		return;
	}