How do I get raw pulse wave data on my Fitbit device?

[cooltaka]

I want to develop a health app. How do I get raw pulse wave data on my Fitbit device? This raw data is expected to have a sampling frequency of 512Hz and a level of about 16 bits. As for the timing, I want to make a request to the device every minute and get the data for the past minute. The command was not found in WebAPI. Any method other than WebAPI is acceptable. Thank you.

[Gondwana]

The Fitbit API doesn't provide that sort of data.