bp_get_group_type_post_id( string $group_type = '' )

function bp_get_group_type_post_id( $group_type = '' ) {

	$args = array(
		'post_type'		=>	'bp-group-type',
		'meta_query'	=>	array(
			array(
				'key'   => '_bp_group_type_key',
				'value'	=>	$group_type
			)
		)
	);
	$group_type_query = new WP_Query( $args );

	$posts = $group_type_query->posts;

	$id = ( is_array( $posts ) && isset( $posts[0]->ID ) ) ? $posts[0]->ID : 0;

	return $id;
}