Using RevenueCat and Superwall together

import AdSupport
// ...
Purchases.configure(withAPIKey: "public_sdk_key")
// ...configure Superwall per its docs...

Task {
    // Read the Appstack identity once
    let attribution = await AppstackAttributionSdk.shared.getAttributionParams() ?? [:]

    // RevenueCat = subscription data source (include the Appstack ID)
    var rcParams = attribution
    if let id = AppstackAttributionSdk.shared.getAppstackId() {
        rcParams["appstack_id"] = id
    }
    Purchases.shared.attribution.setAppstackAttributionParams(rcParams) { offerings, error in
        // Attribution + subscription data now flow through RevenueCat.
        // Superwall presents the paywall, so you can ignore these `offerings`.
    }

    // Superwall = paywalls only (attribution params for targeting; no Appstack ID)
    Superwall.shared.setUserAttributes(attribution)
    Superwall.shared.register(placement: "onboarding_paywall")
}

// ...
Purchases.configure(this, "public_sdk_key")
// ...configure Superwall per its docs...

fun wireAppstack() {
    // Read the Appstack identity once
    val attribution = AppstackAttributionSdk.getAttributionParams()

    // RevenueCat = subscription data source (include the Appstack ID)
    val rcParams = attribution.toMutableMap()
    AppstackAttributionSdk.getAppstackId()?.let { rcParams["appstack_id"] = it }
    Purchases.sharedInstance.setAppstackAttributionParams(
        rcParams,
        object : SyncAttributesAndOfferingsCallback {
            override fun onSuccess(offerings: Offerings) {
                // Superwall presents the paywall, so you can ignore these `offerings`.
            }
            override fun onError(error: PurchasesError) { /* handle error */ }
        }
    )

    // Superwall = paywalls only (attribution params for targeting; no Appstack ID)
    Superwall.instance.setUserAttributes(attribution)
    Superwall.instance.register("onboarding_paywall")
}

// Call wireAppstack() after Appstack, RevenueCat, and Superwall are configured.

// RevenueCat via react-native-purchases, Superwall via expo-superwall
import { useEffect } from "react";
import { useUser, usePlacement } from "expo-superwall";

// RevenueCat = subscription data source. Run once at startup.
async function configureRevenueCat() {
  Purchases.configure({ apiKey: "public_sdk_key" });

  const attribution = (await AppstackSDK.getAttributionParams()) ?? {};
  const rcParams = { ...attribution };
  const id = await AppstackSDK.getAppstackId();
  if (id != null) {
    rcParams["appstack_id"] = id;
  }
  await Purchases.setAppstackAttributionParams(rcParams);
  // Superwall presents the paywall, so you can ignore the returned offerings.
}

// Superwall = paywalls only. Hooks stay at the component's top level.
function Paywall() {
  const { update } = useUser();
  const { registerPlacement } = usePlacement();

  useEffect(() => {
    (async () => {
      const attribution = (await AppstackSDK.getAttributionParams()) ?? {};
      await update(attribution); // attribution params for targeting; no Appstack ID
      await registerPlacement({ placement: "onboarding_paywall" });
    })();
  }, [update, registerPlacement]);

  // ...render your paywall UI
}

// ...
await Purchases.configure(PurchasesConfiguration("public_sdk_key"));
// ...configure Superwall per its docs...

// Read the Appstack identity once
final attribution = await AppstackPlugin.getAttributionParams() ?? <String, dynamic>{};

// RevenueCat = subscription data source (include the Appstack ID)
final rcParams = Map<String, dynamic>.from(attribution);
final id = await AppstackPlugin.getAppstackId();
if (id != null) {
  rcParams['appstack_id'] = id;
}
await Purchases.setAppstackAttributionParams(rcParams);
// Superwall presents the paywall, so you can ignore the returned offerings.

// Superwall = paywalls only (attribution params for targeting; no Appstack ID)
await Superwall.shared.setUserAttributes(attribution);
await Superwall.shared.register('onboarding_paywall');