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// Add Shortcode
function miva_cat_shortcode( $atts ) {
	// Attributes
	extract( shortcode_atts(
		array(
			'code' => '',
		), $atts )
	);
	// Code
	$hostname = $_SERVER['SERVER_NAME'];
	return file_get_contents("http://" . $hostname . "/mm5/merchant.mvc?Screen=CTGY&Store_Code=YOURSTORECODEHERE&Category_Code=".$code."&Sort_By=disp_order&Per_Page=-1&phpDisplay=1");
}
add_shortcode( 'miva_cat', 'miva_cat_shortcode' );