We previously announced that by August 15, 2009, the Product Advertising API will require all requests to be authenticated using request signatures. Most of you have already implemented signed requests or are in the process of implementing it, and we thank you for your timely cooperation.

As of August 15, 2009, the Product Advertising API requires request signatures. If your calls to the API are being rejected, please check to ensure that your requests are correctly signed. Requests that are correctly signed will not be affected.

If your calls to the API are being rejected, please take a look at the resources we’ve made available to help you implement signed requests:

• The Developer Guide has details on what signed requests are and how to construct signed requests.
• Sample Code for Signed Requests is available in Java, C# and Perl.
• Our technical staff and other customers are available to answer questions on our Community Forum .
• More resources can be found at the Product Advertising API home page .

We thank you for advertising our products and look forward to sharing the revenue from these sales