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Trial start and conversion events not sent to AppsFlyer

  • July 18, 2025
  • 1 reply
  • 106 views
O
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Hi,

I’m running into an issue where development builds (via Xcode) are not generating an appsflyer_id, and consequently, no S2S events are being sent from RevenueCat to AppsFlyer. Here’s what I’ve observed:

What’s happening

  • In dev builds, Apple zeros out IDFA and IDFV for sideloaded apps, even with ATT consent.

  • Without IDFA/IDFV, AppsFlyer SDK cannot create a valid appsflyer_id, which is required for event attribution.

  • As a result, RevenueCat never sends server-to-server purchase or trial events because it doesn’t have the mandatory identifier.

  • I’ve implemented the suggested methods—collectDeviceIdentifiers() and setAppsflyerID()—but since the SDK doesn’t generate the ID in dev builds, RevenueCat still fails to send any events.

Questions

  1. Is there a recommended workaround for dev builds when IDs are zeroed?
    (e.g., can we manually set a fake $appsflyerId or use an IDFV workaround?).

  2. Any best practices for testing with Xcode‑installed apps so that both AppsFlyer and RevenueCat work as expected?

  3. In production/TestFlight, everything works smoothly. But our CI/debug environment doesn’t—any idea how to get S2S events flowing in dev?

Thanks in advance for any guidance or best practices 🙏
Happy to supply logs or screenshots if helpful!

Best answer by hussain

Hi Ole,

Thanks for reaching out. I’m happy to help. For CI/debug environments I’d recommend you to Manually override the AppsFlyer ID. You can generate a stable test ID (e.g. a UUID or hardcoded string) and set it directly as the AppsFlyerID right after configuration of the RevenueCat SDK.

Purchases.configure(withAPIKey: "<YOUR_REVENUECAT_KEY>")
// Before any purchase/trial:
let testAFID = "DEV_DEVICE_AF_ID"
Purchases.shared.attribution.setAppsflyerID(testAFID)

This guarantees a valid $appsflyerId which is required for RevenueCat to send events to AppsFlyer.

Hope this helps. Let me know if you have any other questions.

Best,

Hussain

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1 reply

hussain
RevenueCat Staff
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  • hussain
  • RevenueCat Staff
  • Answer
  • July 22, 2025

Hi Ole,

Thanks for reaching out. I’m happy to help. For CI/debug environments I’d recommend you to Manually override the AppsFlyer ID. You can generate a stable test ID (e.g. a UUID or hardcoded string) and set it directly as the AppsFlyerID right after configuration of the RevenueCat SDK.

Purchases.configure(withAPIKey: "<YOUR_REVENUECAT_KEY>")
// Before any purchase/trial:
let testAFID = "DEV_DEVICE_AF_ID"
Purchases.shared.attribution.setAppsflyerID(testAFID)

This guarantees a valid $appsflyerId which is required for RevenueCat to send events to AppsFlyer.

Hope this helps. Let me know if you have any other questions.

Best,

Hussain

Hussain, Developer Support Engineer (RevenueCat)
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