Please use Services_Amazon instead of Services_AmazonECS4.
Deprecated code will not be processed after August 15:
require_once 'Services/AmazonECS4.php'; $amazon = new Services_AmazonECS4(YOUR_ACCESS_KEY_ID); $amazon->ItemSearch(...);
New code works fine:
require_once 'Services/Amazon.php'; $amazon = new Services_Amazon(YOUR_ACCESS_KEY_ID, YOUR_SECRET_ACCESS_KEY); $amazon->ItemSearch(...); // <= backward compatible with Services_AmazonECS4