Right now, only documentation exist for PPE is https://docs.apify.com/platform/actors/publishing/monetize#pay-per-event-ppe-pricing-model and that has very li'l information about how Apify expects developers to implement PPE. I have tried looking into SDK reference but there is very li'l you can know. e.g. I want to understand whether some event charged successfully or got bounced. How do I know from ChargeResult. Charge result says,

eventChargeLimitReached

but what's the meaning of it ? Does that mean next event can't be charged or current event couldn't be charged! https://docs.apify.com/sdk/js/reference/interface/ChargeResult

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