Pega Api can be used, since it contains data ( as work properties), it can be used by blue prism for Automation input,
Once the data are processed, the outcome can be returned to another Api with the case id for changing the Status of the case stage
This is more into Pega platform/ Data Integration capability related,
Just concentrate on, how to fetch case data by Pega Api, and send response back to Pega
There was an enhancement Request, with reference no.
Related Support Case Number: