public virtual async Task <PersistedGrantsDto> GetPersistedGrantsByUserAsync(string subjectId, int page = 1, int pageSize = 10)
        {
            var exists = await PersistedGrantRepository.ExistsPersistedGrantsAsync(subjectId);

            if (!exists)
            {
                throw new UserFriendlyErrorPageException(string.Format(PersistedGrantServiceResources.PersistedGrantWithSubjectIdDoesNotExist().Description, subjectId), PersistedGrantServiceResources.PersistedGrantWithSubjectIdDoesNotExist().Description);
            }

            var pagedList = await PersistedGrantRepository.GetPersistedGrantsByUserAsync(subjectId, page, pageSize);

            var persistedGrantsDto = pagedList.ToModel();

            return(persistedGrantsDto);
        }