Testing the wc-ajax function

gistfile1.txt

add_action( 'wp_ajax_my_ajax_function_', 'my_ajax_function' );

function my_ajax_function() {
	$mystuff = $_POST['stuff'];	
	if ( defined( 'DOING_AJAX' ) && DOING_AJAX  ) { 
		set_transient('fx_mystuff' , $mystuff, '0');
	}
	die();
}

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In the html

jQuery.ajax({
		url : fxmedia.ajax_url,
		type : 'post',
		data : {
			action : 'my_ajax_function',
			security : '{{wp_nonce}}',
			stuff		:	stuff
		},
		success : function( response ) {

		}
	});