To integrate your application with data from an external source, you connect data objects to a system of record by using REST.

1. In the navigation pane of App Studio, click Data.

2. Click Data objects and integrations.

3. Click an existing data object that is not connected to an external system of record.

4. Click the Data views tab and choose one of the following options:

   • If your data object is not connected to a system of record, click Connect to system of record.
   • If your data object is connected to Pega database storage, in the row of the data view with the source that you want to replace, click MoreReplace source.
     Note: If you are replacing an aggregate source, the new source replaces the entire aggregate source. You cannot replace the individual sources within the aggregate source.

5. In the System field, select a system of record.

   • Create new – Create a new system to connect to an external database by using a REST connection. Then, enter a name and a description for the new system.
   • Use an existing system – Select the name of an existing system to connect to an external database by using a REST connection.

6. In the Connection details section, in the Method field, select either GET or POST as the connection method.

7. In the Endpoint URL field, enter the endpoint URL of the data.

8. In the Parameters section, choose which parts of the URL are dynamic and need to be parameterized for future calls.

9. In the Headers section, click Add header to specify a request header and its value. Some services require extra information, for example, API version.

• Mapping fields for the GET method for existing data objects
• Mapping fields for the POST method for existing data objects

• Pega APIs and services