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Using the Process.PluginResult Class

The Process.PluginResult class returns output parameters from the class that implements the interface to the flow.

We recommend using the @InvocableMethod annotation instead of the Process.Plugin interface.

The interface doesn’t support Blob, Collection, and sObject, data types, and it doesn’t support bulk operations. After you implement the interface on a class, the class can be referenced only from flows.
The annotation supports all data types and bulk operations. After you implement the annotation on a class, the class can be referenced from flows, processes, and the Custom Invocable Actions REST API endpoint.
Legacy Apex actions aren’t supported in auto-layout in Flow Builder. Legacy Apex actions are only available to be added in free-form in Flow Builder. Existing actions can be edited in both auto-layout and free-form mode.
You can customize how invocable actions created with @InvocableMethod appear in Flow Builder by using the InvocableActionExtension metadata file. Control parameter order, add picklists, create custom headers, and build partial custom property editors.

Tip

You can instantiate the Process.PluginResult class using one of the following formats:

Process.PluginResult (Map<String,Object>)
Process.PluginResult (String, Object)

Use the map when you have more than one result or when you don't know how many results are returned.

The following is an example of instantiating a Process.PluginResult class.

1string url = 'https://docs.google.com/document/edit?id=abc';
2                String status = 'Success';
3                Map<String,Object> result = new Map<String,Object>();
4                result.put('url', url);
5                result.put('status',status);
6                new Process.PluginResult(result);

Apex Developer Guide

Using the Process.PluginResult Class