By August 15, 2009, all calls to the Amazon® Product Advertising API must be signed to authenticate the request. Ulrich Mierendorff developped a simple function in PHP that lets you make authenticated requests with only a few lines of code. He is also the author of “Antialiased filled Arcs/Ellipses” for PHP and of the rounded css boxes.
Amazon’s guidelines for signing requests are available on the AWS website.
The following error messages are sent:
- the timestamp is old : Request has expired