I'm trying to use ION API, so I filled URL of my callback script in API Settings. It works fine when I'm doing test endpoint from your interface, but it doesn't in real transaction.
Just for testing I added following debugging code:
$handle = fopen("request.txt", "w");
$out = print_r($_REQUEST,1);
When I'm doing test endpoint it creates text file with parameters so everything is ok, but when I'm buying something using shopping card it doesn't create file.
Could you please check what I'm doing wrong? Thanks!