Ads with SKOverlay, will the fidelity type be 1 as StoreKid-rendered ads...? yes can SKOverlay be used in tandem with SKStoreProductViewController in a Storekit Rendered Ad within SKAdNetwork framework? Yes. not sure about your second question "are there ad size guidelines..."

Also I think this part of the documentation here conflicts with some other documentation here: required for 4 and later: sourceIdentifier required for 2 and later: adNetworkPayloadVersion adNetworkSourceAppStoreIdentifier required: adNetworkId adNetworkCampaignId adNetworkImpressionTimestamp adNetworkNonce adNetworkAttributionSignature see how adNetworkCampaignId is marked as required. and: Use SKStoreProductParameterAdNetworkSourceIdentifier instead of this value to generate version 4 and later signatures. I assume the second doc is accurate: no need to provide SKStoreProductParameterAdNetworkSourceIdentifier, but sourceIdentifier is required for skad version 4.0. Is that correct?

According to this Apple video, it seems possible. The relevant part of the video is here (transcript): “The next class is the AppConfiguration. And this configuration can be used to display any app. Much of these two classes is the same. So let’s start there. Both classes have a campaign token and a provider token so that you can use SKOverlay with app analytics. They also have functions that allow you to set and get arbitrary key values. Now most developers don’t need to use these but they’re there so you can integrate SKOverlay with other StoreKit APIS such as SKAdNetwork.” But there are no clear technical information on how to do it (which additionalValue keys to set...) Unfortunately, I didn't find any additional information.