public virtual Task <PersonFace> GetPersonFaceAsync(string personGroupId, Guid personId, Guid persistedFaceId)
 {
     return(PolicyService.ExecuteRetryAndCapture400Errors(
                "FaceService.GetPersonFaceAsync",
                ApiKeys.FaceRetryInSeconds,
                () =>
     {
         var result = FaceRepository.GetPersonFaceAsync(personGroupId, personId, persistedFaceId);
         return result;
     },
                null));
 }