Ive read through these pages a few times and can't see anything that answers my problem. I'm on a Linux server I have the 3 necessary files in the cgi-bin all on 775 I also have libstdc++-libc6.2-2.so.3 and libCcCpiTools.so in the cgi-bin as the server is not in safe mode. I have the path to the cgi-bin correct /home/yduozcnp/public_html/cgi-bin. I have SSL set up and the store is secure. The store details are set correctly and I have the site in GBP. At first I was getting a hacking error, but then realised that TestHash.e didnt have the correct permissions. After they were set correctly I now receive 'The transaction failed because of invalid input data.' Any ideas what could be wrong? Thank you.