feat: PPE + Standby (#1612)

Co-authored-by: Michał Olender <92638966+TC-MO@users.noreply.github.com>

Author: mhamas

sources/platform/actors/development/programming_interface/actor_standby.md

@@ -186,4 +186,5 @@ The URL is exposed as an environment variable `ACTOR_STANDBY_URL`. You can also
 
 ## Monetization of Actors with the Standby mode?
 
-Currently, the Standby mode is in beta, and monetization is not supported. But we plan to enable it soon.
+You can monetize Standby Actors just like any other Actor. For best results with Standby workflows, use pay-per-event monetization model.
+When monetizing your Actor in Standby mode using pay per event mode, you are not responsible for covering the platform usage costs of your users' runs. Users will need to cover both the platform usage costs (paid to Apify) and event costs (paid to you).

sources/platform/actors/publishing/monetize.mdx

@@ -178,6 +178,12 @@ The following table summarizes the platform unit costs used for your cost comput
 
 If you decide not to offer tiered discounts on your Actor, the unit prices for _FREE_ tier apply. To offer enterprise level services and unlock even cheaper unit prices for enterprise customers, please reach out to us.
 
+:::note Cost of PPE Actors in Standby mode
+
+When you monetize your Actor in Standby mode using pay per event mode only, you are not responsible for covering platform usage costs of your users' runs.
+
+:::
+
 ## Setting up monetization
 
 Navigate to your [Actor page](https://console.apify.com/actors?tab=my) in Apify Console, choose the Actor that you want to monetize, and select the Publication tab.

sources/platform/actors/running/store.md

@@ -167,6 +167,10 @@ You would still pay for all interactions after the Actor run finishes, same as f
 
 You would still pay for the long term storage of results, same as for pay per result Actors.
 
+#### Some Actors declare that I still need to pay for usage, how come?
+
+When an Actor operates in [Standby mode](https://docs.apify.com/platform/actors/running/standby), you control how the background runs scale and how efficiently they are utilized. In this case, you are responsible for paying the platform usage costs of these runs in addition to the event charges. Some selected Standby Actors may have this usage component waived, so always check the pricing page of the specific Actor to determine whether you will be charged for usage or only for events.
+
 #### Where do I see how much I was charged for the pay per result Actors?
 
 Similarly to pay per result Actors, you can see how much you have been charged on your invoices, and on the [Usage tab](https://console.apify.com/billing) of the Billing section in the Console.