Data Payload Handler currently allows us only one action, that is to Add a New Parameter.
This can be done by 3 Parameter Types.
Constant value - By simply imputing the Constant value into the field.
Text - Free form - Data that are not in fixed locations. The term refers to free-form text in business documents and reports, news articles and social media. For example, unstructured data are found in word processing files, PDF files, email messages, Internet forums, blogs, Web pages, Twitter feeds and Facebook pages.
Get Data From Data Type - allows getting data dynamically from an existing data type by selecting the parameter key and value from the dropdown menu.