public async Task <SpecificationSummary> GetSpecificationSummaryById(string specificationId)
        {
            Guard.ArgumentNotNull(specificationId, nameof(specificationId));

            string url = $"{specsUrl}{specificationId}";

            return(await _apiClient.GetAsync <SpecificationSummary>(url));
        }
        public Task <SpecificationSummary> GetSpecificationSummaryById(string specificationId)
        {
            if (string.IsNullOrWhiteSpace(specificationId))
            {
                throw new ArgumentNullException(nameof(specificationId));
            }

            string url = $"{specsUrl}{specificationId}";

            return(_apiClient.GetAsync <SpecificationSummary>(url));
        }