About Apex Settings and Invoke Operations
Invoke Apex REST Method (introduced in version 6.2.0) and Invoke Apex Soap Method (introduced in 6.1.0) work with Apex Class Name settings. When you connect to Salesforce, the Salesforce connector gets the names of the Apex classes and methods belonging to them that can be invoked.
All Salesforce connection configurations support these Apex settings:
Fetch All Apex SOAP Metadata - Fetches the metadata of all the Apex SOAP classes. Takes precedence over Apex Class Name settings.
Fetch All Apex REST Metadata - Fetches the metadata of all the all Apex REST classes. Takes precedence over Apex Class Name settings.
Apex Class Name - List of Apex class names to use for limiting the set of classes you fetch along with the methods they expose. This setting can speed the fetch process if there are a lot of classes that you do not need to fetch.