Data Preparation
Before invoking Web Service, we need to prepare data to be passed across to the Web Service. This can be done by configuring the Application Rule.
In the above example, data preparation is done through JSON Read From DB
Application Rule as shown below, which reads data from a table, converts it into JSON,
and stores output to JSON_DB_DATA Data Field.

Figure 9-2 Add API Details

For more information, see JSON Read From DB Application Rule section.