public HttpResponseMessage RetriveAllDocuments(Int64 merchantId, Int64 contractId)
 {
     IList<DocumentsModel> response;
     using (DocumentTier dT = new DocumentTier())
     {
         response = dT.RetrieveAllDocs(merchantId, contractId);
         return this.Request.CreateResponse(HttpStatusCode.OK, response);
     }
 }