Difference between SCOPE and DATA_SOURCE in Fitness API

Question

I'm working on fetching heart rate data from Google Fitness API using python and I would like to know what is the difference between hear rate SCOPE "https://www.googleapis.com/auth/fitness.heart_rate.read" and DATA_SOURCE "derived:com.google.heart_rate.bpm:com.google.android.gms:merge_heart_rate_bpm" under "https://www.googleapis.com/auth/fitness.activity.read" SCOPE?
I search and did not find answer. Google documentation is not clear about this.

Answer 1

You can the scopes and the list of what they do here Fitness API, v1

• https://www.googleapis.com/auth/fitness.activity.read Use Google Fit to see and store your physical activity data
• https://www.googleapis.com/auth/fitness.heart_rate.read See your heart rate data in Google Fit. I consent to Google sharing my heart rate information with this app.