[Guide] iOS In-App Purchases (IAP) Working in Unreal Engine (with Game Center + Apple Login)
Hey devs 
— after a lot of headbanging, I finally got In-App Purchases working in Unreal Engine on iOS, along with Game Center and Apple Login. Sharing everything I did so others don’t go through the same mess. 
My Setup
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Unreal Engine: 5.4 (from source)
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Platform: iOS (iPad + iPhone)
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Online Subsystem: iOS
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IAP Method: Blueprint + App Store Connect
What Worked
1. Configure DefaultEngine.ini / IOSEngine.ini
[OnlineSubsystem]
DefaultPlatformService=IOS
[OnlineSubsystemIOS.Store]
bSupportsInAppPurchasing=true
bUseStoreV2=true
[/Script/IOSRuntimeSettings.IOSRuntimeSettings]
bEnableGameCenterSupport=True
2. Fix Unreal Signing & Entitlements
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Set Bundle Identifier to match your App Store app (e.g. com.YourCompany.Gamename)
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Turn OFF “Automatically manage signing” in both Unreal and Xcode
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Use Modern Xcode Build System in DefaultEngine.ini
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Provisioning Profile MUST have:
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Game Center
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In-App Purchase
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Signed with a valid Distribution or Development cert
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3. Generate & Open Xcode Project
Run this in Terminal:
/Path/To/UnrealEngine/Engine/Build/BatchFiles/Mac/GenerateProjectFiles.sh \
-project=“/Path/To/YourProject/YourProject.uproject” \
-game -engine
Then:
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Open the .xcodeproj
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Manually add Capabilities:
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Game Center
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In-App Purchase
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Assign the correct provisioning profile and turn off auto-signing
IMPORTANT: Archive Using Xcode, Not Unreal
Unreal’s built-in packaging tool may not correctly embed entitlements (e.g., Game Center, In-App Purchase).
ALWAYS do the final Archive in Xcode to ensure all capabilities are added properly.
How:
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In Xcode, go to Product > Archive
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Export the .ipa from Organizer
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Upload to TestFlight or test locally
4. Add In-App Products in App Store Connect
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Go to App Store Connect > My App > Features > In-App Purchases
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Add product (e.g., com.YourCompany.YourProject.goldcoins100)
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Make sure:
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Status is “Ready to Submit” or higher
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Localized name and pricing are filled
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Your app is uploaded via TestFlight or marked for review
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5. Test on Real Device with Sandbox Account
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Must use a Sandbox Apple ID (Settings > App Store > Sign Out > Log into Sandbox)
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Simulator won’t work
Log output shows:
Returning 0 product(s) and 1 invalid identifier(s) // if product not added to App Store Connect
6. Blueprint Notes
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Use Query In App Purchases node
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Product Identifiers MUST match App Store exactly
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Access IOS subsystem explicitly if your default is EOS
| Step |
Description |
|---|---|
| DefaultEngine.ini | Set bSupportsInAppPurchasing=true, Game Center = true |
| Xcode Project | Add Capabilities manually |
| App Store Connect | Create product IDs before testing |
| Archive | MUST archive from Xcode to embed entitlements |
| TestFlight/Sandbox | Must test with valid Apple ID |
| Logs | Use Console app, Xcode Devices tab, or idevicesyslog |
Hope this helps someone avoid the same chaos 
If you’re stuck, reply here — happy to share Blueprints or C++ examples.
Cheers!