Message Digest

 Used to calculate a digest of the payload or parts of it and store the result in a message header.

We can transform part of the message, enter an XPath expression to specify the part (optional attribute). Can also define a prefix namespace mapping.

Hash 

Address:  https://refapp-espm-ui-cf.cfapps.eu10.hana.ondemand.com/espm-cloud-web/espm.svc/

Target Header Name:

Enter the name of the target header element which is to contain the hash value (digest). This is a mandatory attribute

When tested first (without changing anything in the payload), the below MD5 hash was generated :

AVWgPTQU1b/X/YC/4ANlwA==

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On the second test run, we added a new customer review in the OData WebShop API ( so we get a different response compare to earlier to view the disparity in MD5 Values)

Can see below the customer review was added in the Response Payload:

 As the response (input to MD5) has been changed, the resulted MD5 hash value should also be changed.

New MD5 Hash value :

rFH0pP+laZpYaZ7D13mniQ==

See the below Header (Name as per given in the configuration)

Data Store Screen: