Description

test.php

<?php

public function add_meta_box( $post_type ) {
        $post_type = 'notes';             //limit meta box to certain post types
			add_meta_box(
				'handshaken_note_settings', 
				__( 'Note Settings', 'handshaken' ), 
				array( $this, 'render_meta_box_content_note' ),
				$post_type,
				'advanced',
				'high'
			);
		$post_type = 'senders';             //limit meta box to certain post types
			add_meta_box(
				'handshaken_sender_settings', 
				__( 'Sender Settings', 'handshaken' ), 
				array( $this, 'render_meta_box_content_sender' ),
				$post_type,
				'advanced',
				'high'
			);
		$post_type = 'recipients';             //limit meta box to certain post types
			add_meta_box(
				'handshaken_sender_settings', 
				__( 'Sender Settings', 'handshaken' ), 
				array( $this, 'render_meta_box_content_recipient' ),
				$post_type,
				'advanced',
				'high'
			);
	}