RevenueCat subscription purchases not registering.

Hello RevenueCat community,

I am a new user of RevenueCat and am having issues with processing subscription purchases. Here is the relevant information.
- App designed no-code in FlutterFlow
- App connected and products connected in RevenueCat
- App uses Firebase for Users and Authentication information
- Google Analytics functions properly and shows user events
- Licensing is set up for purchases in Google Developer Console with the test account I am using
- RevenueCat extension is set up in Firebase
- Firebase integration is set up in RevenueCat
- RevenueCat service account is active. I have for now given Admin permissions for everything, so there should be no restrictions because I was encountering some access errors earlier that seem to have been fixed. 
- The service account JSON was generated and uploaded in RevenueCat and RevenueCat shows connected to Google. 
- Firebase, RevenueCat, and Google analytics are enabled and seem to be functioning with FlutterFlow
- Sandbox Data is checked on the overview page

When testing on an android device, purchases function correctly (the Google Play store opens on the bottom screen, and confirms the subscription purchase). The problem is that the test purchases and user information are not showing up in RevenueCat. I see 88 users in the RevenueCat overview, but no further information. No test purchases, no customers, and no event triggers show within RevenueCat.

Some additional questions I have that may be related:
In the RevenueCat docs "Set Firebase User Identity in RevenueCat" it says
"You should make sure to use the Firebase UID as the RevenueCat app user ID when setting the Firebase user identity in RevenueCat. This step is optional, but highly recommended as a best practice for the Google Analytics portion of this integration. The Firebase Extension portion requires this step to be completed." 
The firebase UID is the UID logged into my app when making the purchase, is that what this is referring to? If not please explain further.

In the RevenueCat docs it says "Before installing this extension, set up the following Firebase services in your Firebase project.
(optional) Cloud Firestore to store In-App Purchases & Subscriptions details."
Cloud Firestore is working, and storing user data properly, but not anything related to In-App purchases as of yet. Is there additional information for implementing this, if needed? Flutterflow is deferring to RevenueCat for handling this it seems, and there does not seem to be any settings to set up IAP via Firebase and Flutterflow. 

Thank you for your time, please get back to me with an answer to my questions or if you need any further information ASAP!

Kindest regards,
Advanced Mind Programs