How to separate business-data and process-data when my application integrates Camunda BPM by RESTful API?

Hi,

Now I will integrate the Camunda BPM to my Application by restful api.
Also, I want to save the business-data to my business database,and don’t send it to BPM .
What should I do?
(PS: sorry, my English is not good, please forgive me )

Thanks,
Mr.Liu