Should I include the App User ID in the Purchases script with a Unity based iOS app?

Hi everyone,

I’m currently improving the subscription setup for a few Unity-based iOS apps, following the RevenueCat UnityInstallation Guide.

While testing with sandbox accounts on devices, I noticed an issue:

• If I include the App User ID in the Purchases script, the app assumes I’ve already made a non-consumable lifetime purchase.
• When I remove the App User ID from the script, sandboxed purchases work perfectly and the transaction shows up in the RevenueCat Overview with Sandboxed data.  

This brings me to my question:

• Should I include the App User ID when publishing the app to the App Store?
• What are the implications of not entering the App User ID? For example, would it affect RevenueCat’s ability to track future purchases or customers?

Thank you in advance for your help!

Cheers!
-DJ