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Hi @Mhristov,
Welcome to the forums!
I'm not sure what RRI is, but are you asking for real-time or raw heart rate sensor data from the Versa 3? If so, the Fitbit Web APIs don't support real-time or raw sensor data. You'll need to make use of the Device SDK and utilize the Device API to access the Versa 3's sensor data.
If you only need historical granular data, the Intraday endpoints is what you'll need to access that data.
Let me know if you have any additional questions.
Best Answer