Yello everyone 🙂 Yesterday I generated Access ID and Secret Key to try the API, but it didn't work. It's said that it might need 5 minutes, so I gave it something like 8 hours but it still didn't work afterwards. I used the PHP sample and I checked it with the Sample Expires value and it produces the same Signature parameter as in the Sample Valid API Signature, so the PHP code sample and the Sample Valid API Signature are in sync. In case you wonder - yes I changed the PHP sample by adding the valid strings for $accessID and $secretKey - I'm a long time programmer and I know what I'm doing with it. I tried also the example URL from Sample Valid API Signature couple of times, refreshing each time to get new Expire parameter, but it's not working too. Both the PHP sample and the Sample Valid API Signature are giving me this: **{ "status" : "401", "error_message" : "Your authentication failed. Check your authentication details and try again. For more information on signed authentication, see: http://apiwiki.seomoz.org/w/page/29574176/SignedAuthentication" }** I am new here and if there is another place to look for support please just point it out and excuse me for wasting your time - I just couldn't see it and I really tried. Thank you for your time to read this! Calvin Your Access ID: