The AWS Access Key ID is an alphanumeric token distributed by Amazon that uniquely identifies a request sender. This ID must be included in every request using the AWSAccessKeyId parameter, as follows.
http://ecs.amazonaws.com/onca/xml? Service=AWSECommerceService& AWSAccessKeyId=[Your Access Key ID]& Operation=ItemLookup& ItemId=[An ASIN]
Note: | Before the introduction of the AWS Access Key ID, ECS used the Subscription ID for a similar purpose. If you have a Subscription ID, you can use its value with the |