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// Text Field
woocommerce_wp_text_input( 
	array( 
		'id'          => '_text_field', 
		'label'       => __( 'My Text Field', 'woocommerce' ), 
		'placeholder' => 'http://',
		'desc_tip'    => 'true',
		'description' => __( 'Enter the custom value here.', 'woocommerce' ) 
	)
);