Process face

Note: This endpoint should be called only after selfie
and front-id both are over.

It is validating user's selfie against photo from ID (1:1 recognition).
Also, this call validates if user already exists in the system (1:N recognition).

It is highly recommended that before calling this process-face endpoint, one should first finish following endpoints:
add-front, add-back(not required in case of passports),
process-id and add-selfie in order to get complete result view
based on id verification, face recognition and liveness.