diff --git a/Back/Back.csproj b/Back/Back.csproj
index a6bcdd4..899d7e4 100644
--- a/Back/Back.csproj
+++ b/Back/Back.csproj
@@ -23,6 +23,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
+    <PackageReference Include="TaxCollectData.Library" Version="0.0.15" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/Back/Controllers/TaxPayerController.cs b/Back/Controllers/TaxPayerController.cs
index 87a6145..ce8088b 100644
--- a/Back/Controllers/TaxPayerController.cs
+++ b/Back/Controllers/TaxPayerController.cs
@@ -67,5 +67,23 @@ namespace Back.Controllers
 
             return Ok(await _servTaxPayer.PreparationInvoiceBeforeSending(item, result));
         }
+        [HttpPost("CheckAuth")]
+        public async Task<ActionResult<string>> CheckAuth([FromBody] CheckAuthDTO item)
+        {
+
+            if (item == null)
+                return BadRequest("مدل صحیح نمی باشد");
+
+            using (ActionTaxPayer action = new ActionTaxPayer(item.UniqueMemory, item.PrivateKey))
+            {
+                if (action.login())
+                    return Ok();
+            }
+            
+            
+
+            return BadRequest();
+
+        }
     }
 }
diff --git a/Back/Services/ActionTaxPayer.cs b/Back/Services/ActionTaxPayer.cs
new file mode 100644
index 0000000..60772ea
--- /dev/null
+++ b/Back/Services/ActionTaxPayer.cs
@@ -0,0 +1,85 @@
+using Back.Common;
+using TaxCollectData.Library.Business;
+using TaxCollectData.Library.Dto.Config;
+using TaxCollectData.Library.Dto.Content;
+using TaxCollectData.Library.Dto.Properties;
+using TaxCollectData.Library.Dto.Transfer;
+using TaxCollectData.Library.Enums;
+
+namespace Back.Services
+{
+    public class ActionTaxPayer : IDisposable
+    {
+        private string _UniqueMemory;
+        public ActionTaxPayer(string UniqueMemory, string PrivateKey)
+        {
+            #region TokenTax
+            if (!string.IsNullOrEmpty(UniqueMemory) && !string.IsNullOrEmpty(PrivateKey))
+            {
+                _UniqueMemory = UniqueMemory;
+
+                TaxApiService.Instance.Init(UniqueMemory,
+                                 new SignatoryConfig(PrivateKey, null),
+                                 new NormalProperties(ClientType.SELF_TSP), "https://tp.tax.gov.ir/req/api/");
+                TaxApiService.Instance.TaxApis.GetServerInformation();
+            }
+            #endregion
+        }
+        public string GenerateTaxid(string FactorNo, string InvoiceDate)
+        {
+            return TaxApiService.Instance.TaxIdGenerator.GenerateTaxId(_UniqueMemory,
+                   Convert.ToInt64(FactorNo), InvoiceDate.ToMiladi());
+        }
+
+        public InquiryResultModel GetResultByUid(string uid)
+        {
+            if (!login())
+                return null;
+            var uidAndFiscalId = new UidAndFiscalId(uid, _UniqueMemory);
+            var inquiryResultModels = TaxApiService.Instance.TaxApis.InquiryByUidAndFiscalId(new() { uidAndFiscalId });
+            if (inquiryResultModels.Count > 0)
+                return inquiryResultModels[0];
+            return null;
+        }
+        public TaxCollectData.Library.Dto.HttpResponse<AsyncResponseModel> SendInvoice(InvoiceHeaderDto header, List<InvoiceBodyDto> InvoiceBody, PaymentDto payment)
+        {
+            if (!login())
+                return null;
+            return TaxApiService.Instance.TaxApis.SendInvoices(new List<InvoiceDto>()
+          {
+              new InvoiceDto()
+              {
+                  Header =header,Body =InvoiceBody,Payments  = new() {payment}
+              }
+          }
+            , null);
+        }
+        public EconomicCodeModel? GetEconomicCodeInformation(string Item)
+        {
+            return TaxApiService.Instance.TaxApis.GetEconomicCodeInformation(Item);
+        }
+        //-------------------internal
+        public bool login()
+        {
+            try
+            {
+                if (TaxApiService.Instance.TaxApis.GetToken() is null)
+                {
+                    if(TaxApiService.Instance.TaxApis.RequestToken()==null)       
+                    return false;
+                }
+                return true;   
+            }
+            catch (Exception)
+            {
+                return false;
+            }
+           
+        }
+
+        public void Dispose()
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/Back/Services/servTaxPayer.cs b/Back/Services/servTaxPayer.cs
index e37da63..04f5941 100644
--- a/Back/Services/servTaxPayer.cs
+++ b/Back/Services/servTaxPayer.cs
@@ -251,5 +251,7 @@ namespace Back.Services
            // }
 
         }
+
+
     }
 }
diff --git a/Shared/DTOs/CheckAuthDTO.cs b/Shared/DTOs/CheckAuthDTO.cs
new file mode 100644
index 0000000..0b2eb6f
--- /dev/null
+++ b/Shared/DTOs/CheckAuthDTO.cs
@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Shared.DTOs
+{
+    public class CheckAuthDTO
+    {
+        public string UniqueMemory { get; set; }
+        public string PrivateKey { get; set; }
+    }
+}