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// Checkbox
woocommerce_wp_checkbox( 
array( 
	'id'            => '_checkbox', 
	'wrapper_class' => 'show_if_simple', 
	'label'         => __('My Checkbox Field', 'woocommerce' ), 
	'description'   => __( 'Check me!', 'woocommerce' ) 
	)
);