Amazon Product Advertising API Developer's Manual page 181

Product Advertising API Developer Guide
Name
HMAC
MergeCart
ResponseGroup
CartClear also accepts the parameters that all operations can use. For more information, see,
Request Parameters (p. 210).
Response
Name
Cart
CartClearRequest
CartId
HMAC
URLEncodedHMAC
For more information about the parent elements of these tags, see the appropriate response group in
Response Groups (p. 213)
Examples
Remove all items from a specified cart:
http://webservices.amazon.com/onca/xml?
Service=AWSECommerceService&
AWSAccessKeyId=[AWS Access Key
CartClear
Description
The Hash Message Authentication Code is an encrypted
alphanumeric token that is used to authenticate requests.
Type: String
Default: None
Valid Values: Value is calculated using request parameters,
their values, a cryptographic function, and the Secret Key,
which acts as the "key" for the function.
This parameter is deprecated.When a customer purchases
items in a remote shopping cart, the items are added to
the customer's Amazon retail shopping cart.
Specifies the types of values to return. You can specify
multiple response groups in one request by separating
them with commas.
Type: String
Default: Cart (p. 221)
Description
Container for remote shopping cart related response elements.
Container for CartClear and HMAC .
Alphanumeric token returned by CartCreate that uniquely identifies
a cart.
Hash Message Authentication Code returned by CartCreate that
identifies a cart. This is an encrypted alphanumeric token that is used
to authenticate cart operations.
URL encoded version of the HMAC .This encoding is necessary because
some characters, such as + and /, cannot be included in a URL.
ID]&
API Version 2011-08-01
174
Required
Yes
Deprecated
No
Common