POST api/Pos/Customer/SaveAllCustomers

{
  "Customers": [
    {
      "$id": "2",
      "CUS_Uid": "sample string 1",
      "CUS_Name": "sample string 2",
      "CUS_Code": "sample string 3",
      "CUS_Type": "sample string 4",
      "CUS_Gender": "sample string 5",
      "CUS_Email": "sample string 6",
      "CUS_Phone": "sample string 7",
      "CUS_AddressLine1": "sample string 8",
      "CUS_AddressLine2": "sample string 9",
      "CUS_City": "sample string 10",
      "CUS_Pincode": "sample string 11",
      "CUS_State": "sample string 12",
      "CUS_Country": "sample string 13",
      "CUS_Landmark": "sample string 14",
      "CUS_GST_TRN_Number": "sample string 15",
      "CUS_DateOfBirth": "2025-12-06T09:19:31.7979901+05:30",
      "CUS_AnniversaryDate": "2025-12-06T09:19:31.7979901+05:30",
      "CUS_ContactPersonName": "sample string 16",
      "CUS_ContactPersonNumber": "sample string 17",
      "CUS_Active": true,
      "CUS_CreatedOn": "2025-12-06T09:19:31.7979901+05:30",
      "CUS_CreatedBy": "sample string 18",
      "CUS_ModifiedOn": "2025-12-06T09:19:31.7979901+05:30",
      "CUS_ModifiedBy": "sample string 19",
      "CUS_CompanyUid": "sample string 20",
      "CUS_CustomerGId": "sample string 21",
      "CUS_AreaUid": "sample string 22",
      "CUS_ShippingAddress": "sample string 23",
      "CUS_PriceListUid": "sample string 24",
      "CUS_CreditDays": 1,
      "CUS_CreditLimit": 1.1,
      "CUS_Latitude": "sample string 25",
      "CUS_Longitude": "sample string 26",
      "CUS_AreaSortOrder": 1,
      "Xenia_Area": {
        "$id": "3",
        "Area_UiD": "sample string 1",
        "Area_Name": "sample string 2",
        "Area_Active": true,
        "Area_CreatedOn": "2025-12-06T09:19:31.7979901+05:30",
        "Area_CreatedBy": "sample string 3",
        "Area_ModifiedOn": "2025-12-06T09:19:31.7979901+05:30",
        "Area_ModifiedBy": "sample string 4",
        "Area_CompanyUid": "sample string 5",
        "Xenia_Customers": [
          {
            "$ref": "2"
          },
          {
            "$ref": "2"
          }
        ]
      }
    },
    {
      "$ref": "2"
    }
  ]
}

Sample not available.