public function google_spreadsheet_metabox() {
		add_meta_box(
			'google_spreadsheet-metabox',
			__( 'Google Spreadsheet', 'CalculatorsGoogleSpreadSheetsAddon' ),
			array( $this, 'google_spreadsheet_meta_callback' ),
			MortgagePlatform::$lead,
			'side',
			'core'
		);
	}