public HttpResponseMessage RetrieveMerchantDocuments(int merchantId, int DocumentTypeId)
 {
     MPMerchantDocumentsDetailModel response = new MPMerchantDocumentsDetailModel(); ;
     using (MerchantProfileTier mt = new MerchantProfileTier())
     {
         response.Documents = mt.RetrieveMerchantDocuments(merchantId, DocumentTypeId);
         return this.Request.CreateResponse(HttpStatusCode.OK, response);
     }
 }