Add REST API for BB Press

/**
 * Add REST API for BBPress
 * /
 *  Thanks to Barry at https://bbpress.org/forums/topic/is-there-an-api-for-bbpress/
 */
function bbpress_enable_rest_api() {
	$types = array(
		bbp_get_reply_post_type(),
		bbp_get_forum_post_type(),
		bbp_get_topic_post_type(),
	);

	foreach ( $types as $slug ) {
		$definition = (array) get_post_type_object( $slug );
		$definition['show_in_rest'] = true;
		$definition['rest_controller_class'] = 'WP_REST_Posts_Controller';
		register_post_type( $slug, $definition );
	}
}

add_action( 'bbp_register_post_types', 'bbpress_enable_rest_api', 11 );