docs: Add link to API for PPE event names (apify#1852)

Author: patrikbraborec

sources/platform/actors/publishing/monetize.mdx

@@ -139,6 +139,10 @@ You can also choose not to use it, but then you must handle API integration and
 
 :::
 
+#### PPE event names
+
+To implement pay-per-event pricing, you need to define specific events in your Actor code. You can retrieve the list of available pricing event names using the [Get Actor](https://apify.com/docs/api/v2/act-get) API endpoint.
+
 ### How to attract larger customers of PPE and PPR Actors
 
 Each user running your PPE or PPR Actor belongs to a discount tier: