You can connect any Google Analytics property to RSVPify. If you connect multiple properties, RSVPify will send data to ALL connected GA properties. RSVPify supports:
Universal Analytics
Google Analytics 4
Google Tag Manager
To connect a Google Analytics property:
Access your event
In the left navigation, select Setup > Event Settings > Analytics & Custom Scripts
Enter the ID(s) of the Google Analytics properties you want to send data to
Click Save
RSVPify will automatically track key conversion events for you.