code: public VerifyResult verifyFaceToPerson(UUID faceId, String personGroupId, UUID personId) {
          return verifyFaceToPersonWithServiceResponseAsync(faceId, personGroupId, personId).toBlocking().single().body();
      }
docs: Verify whether two faces belong to a same person. Compares a face Id with a Person Id.
  
  @param faceId FaceId the face, comes from Face - Detect
  @param personGroupId Using existing personGroupId and personId for fast loading a specified person. personGroupId is created in Person Groups.Create.
  @param personId Specify a certain person in a person group. personId is created in Persons.Create.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws APIErrorException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the VerifyResult object if successful.