diff --git a/Hcs.Client/Client/Api/BillsApi.cs b/Hcs.Client/Client/Api/BillsApi.cs
new file mode 100644
index 0000000..505279c
--- /dev/null
+++ b/Hcs.Client/Client/Api/BillsApi.cs
@@ -0,0 +1,23 @@
+using Hcs.Client.Api.Payload.Bills;
+using Hcs.Client.Api.Request.Bills;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Hcs.Client.Api
+{
+    // http://open-gkh.ru/BillsServiceAsync/
+    public class BillsApi(ClientBase client) : ApiBase(client)
+    {
+        /// <summary>
+        /// Импорт сведений о платежных документах
+        /// </summary>
+        /// <param name="payload">Пейлоад сведений о платежных документах</param>
+        /// <param name="token">Токен отмены</param>
+        /// <returns>true, если операция выполнена успешно, иначе - false</returns>
+        public async Task<bool> ImportPaymentDocumentAsync(ImportPaymentDocumentPayload payload, CancellationToken token = default)
+        {
+            var request = new ImportPaymentDocumentRequest(client);
+            return await request.ExecuteAsync(payload, token);
+        }
+    }
+}
diff --git a/Hcs.Client/Client/Api/Payload/Bills/ImportPaymentDocumentPayload.cs b/Hcs.Client/Client/Api/Payload/Bills/ImportPaymentDocumentPayload.cs
new file mode 100644
index 0000000..30c47d7
--- /dev/null
+++ b/Hcs.Client/Client/Api/Payload/Bills/ImportPaymentDocumentPayload.cs
@@ -0,0 +1,229 @@
+using Hcs.Client.Api.Registry;
+using Hcs.Client.Api.Type;
+using System;
+using System.Collections.Generic;
+
+namespace Hcs.Client.Api.Payload.Bills
+{
+    // http://open-gkh.ru/Bills/importPaymentDocumentRequest.html
+    public class ImportPaymentDocumentPayload
+    {
+        // http://open-gkh.ru/Bills/importPaymentDocumentRequest/PaymentInformation.html
+        public class PaymentInformation
+        {
+            /// <summary>
+            /// БИК банка получателя
+            /// </summary>
+            public string bankBIK;
+
+            /// <summary>
+            /// Номер расчетного счета
+            /// </summary>
+            public string operatingAccountNumber;
+        }
+
+        /// <summary>
+        /// Начисление по услуге
+        /// </summary>
+        // http://open-gkh.ru/Bills/PaymentDocumentType/ChargeInfo.html
+        public interface IChargeInfo { }
+
+        /// <summary>
+        /// Главная коммунальная услуга
+        /// </summary>
+        // http://open-gkh.ru/Bills/PDServiceChargeType/MunicipalService.html
+        public class MunicipalService : IChargeInfo
+        {
+            /// <summary>
+            /// Необязательное. Перерасчеты, корректировки, руб.
+            /// </summary>
+            public decimal? moneyRecalculation;
+
+            /// <summary>
+            /// Необязательное. Льготы, субсидии, скидки, руб.
+            /// </summary>
+            public decimal? moneyDiscount;
+
+            /// <summary>
+            /// Необязательное. Норматив потребления коммунальных ресурсов в целях использования и содержания
+            /// общего имущества в многоквартирном доме.
+            /// </summary>
+            public decimal? houseOverallNeedsNorm;
+
+            /// <summary>
+            /// Необязательное. Норматив потребления коммунальных услуг.
+            /// </summary>
+            public decimal? individualConsumptionNorm;
+
+            /// <summary>
+            /// Необязательное. Текущие показания приборов учёта коммунальных ресурсов - индивидуальных
+            /// (квартирных).
+            /// </summary>
+            public decimal? individualConsumptionCurrentValue;
+
+            /// <summary>
+            /// Необязательное. Текущие показания приборов учёта коммунальных ресурсов - коллективных (общедомовых).
+            /// </summary>
+            public decimal? houseOverallNeedsCurrentValue;
+
+            /// <summary>
+            /// Необязательное. Суммарный объём коммунальных ресурсов в многоквартирном доме - в помещениях дома.
+            /// </summary>
+            public decimal? houseTotalIndividualConsumption;
+
+            /// <summary>
+            /// Необязательное. Суммарный объём коммунальных ресурсов в многоквартирном доме - в целях содержания
+            /// общего имущества в многоквартирном доме.
+            /// </summary>
+            public decimal? houseTotalHouseOverallNeeds;
+
+            /// <summary>
+            /// Необязательное. Способ определения объема коммунальных ресурсов при индивидуальном потреблении.
+            /// </summary>
+            public MunicipalServiceVolumeDeterminingMethod? individualConsumptionVolumeDeterminingMethod;
+
+            /// <summary>
+            /// Необязательное. Объем/площадь/кол-во коммунальных ресурсов при индивидуальном потреблении.
+            /// </summary>
+            public decimal? individualConsumptionVolumeValue;
+
+            /// <summary>
+            /// Необязательное. Способ определения объема коммунальных ресурсов при содержании общего имущества.
+            /// </summary>
+            public MunicipalServiceVolumeDeterminingMethod? overallConsumptionVolumeDeterminingMethod;
+
+            /// <summary>
+            /// Необязательное. Объем/площадь/кол-во коммунальных ресурсов при содержании общего имущества.
+            /// </summary>
+            public decimal? overallConsumptionVolumeValue;
+
+            /// <summary>
+            /// Необязательное. Размер повышающего коэффициента.
+            /// </summary>
+            public decimal? multiplyingFactorRatio;
+
+            /// <summary>
+            /// Необязательное. Размер превышения платы, рассчитанной с применением повышающего коэффициента над
+            /// размером платы, рассчитанной без учета повышающего коэффициента, руб.
+            /// </summary>
+            public decimal? amountOfExcessFees;
+
+            /// <summary>
+            /// К оплате за индивидуальное потребление коммунальной услуги, руб.
+            /// </summary>
+            public decimal? municipalServiceIndividualConsumptionPayable;
+
+            /// <summary>
+            /// К оплате за общедомовое потребление коммунальной услуги, руб.
+            /// </summary>
+            public decimal? municipalServiceCommunalConsumptionPayable;
+
+            /// <summary>
+            /// Необязательное. Размер платы за коммунальные услуги, индивидуальное потребление.
+            /// </summary>
+            public decimal? amountOfPaymentMunicipalServiceIndividualConsumption;
+
+            /// <summary>
+            /// Необязательное. Размер платы за коммунальные услуги, общедомовые нужды.
+            /// </summary>
+            public decimal? amountOfPaymentMunicipalServiceCommunalConsumption;
+
+            /// <summary>
+            /// Код услуги из справочника "Вид коммунальной услуги" НСИ 3
+            /// </summary>
+            public RegistryElement serviceType;
+
+            /// <summary>
+            /// Тариф/Размер платы на кв.м, руб./Размер взноса на кв.м, руб.
+            /// </summary>
+            public decimal rate;
+
+            /// <summary>
+            /// К оплате за расчетный период, руб.
+            /// </summary>
+            public decimal totalPayable;
+
+            /// <summary>
+            /// Необязательное. Начислено за расчетный период (без перерасчетов и льгот), руб.
+            /// </summary>
+            public decimal? accountingPeriodTotal;
+        }
+
+        // http://open-gkh.ru/Bills/importPaymentDocumentRequest/PaymentDocument.html
+        public class PaymentDocument
+        {
+            /// <summary>
+            /// Платежный реквизит
+            /// </summary>
+            public PaymentInformation paymentInformation;
+
+            /// <summary>
+            /// Идентификатор лицевого счета
+            /// </summary>
+            public string accountGuid;
+
+            /// <summary>
+            /// Необязательное. Номер платежного документа, по которому внесена плата, присвоенный такому
+            /// документу исполнителем в целях осуществления расчетов по внесению платы
+            /// </summary>
+            public string paymentDocumentNumber;
+
+            /// <summary>
+            /// Начисления по услугам
+            /// </summary>
+            public List<IChargeInfo> chargeInfo;
+
+            /// <summary>
+            /// Необязательное. Задолженность за предыдущие периоды, руб.
+            /// </summary>
+            public decimal? debtPreviousPeriods;
+
+            /// <summary>
+            /// Необязательное. Аванс на начало расчетного периода, руб.
+            /// </summary>
+            public decimal? advanceBllingPeriod;
+
+            /// <summary>
+            /// Необязательное. Итого к оплате за расчетный период c учетом задолженности/переплаты, руб.
+            /// (по всему платежному документу)
+            /// </summary>
+            public decimal? totalPayableByPDWithDebtAndAdvance;
+
+            /// <summary>
+            /// Необязательное. Сумма к оплате за расчетный период, руб. (по всему платежному документу).
+            /// </summary>
+            public decimal? totalPayableByPD;
+
+            /// <summary>
+            /// Необязательное. Оплачено денежных средств, руб.
+            /// </summary>
+            public decimal? paidCash;
+
+            /// <summary>
+            /// Необязательное. Дата последней поступившей оплаты
+            /// </summary>
+            public DateTime? dateOfLastReceivedPayment;
+        }
+
+        /// <summary>
+        /// Месяц расчетного периода платежного документа
+        /// </summary>
+        public int month;
+
+        /// <summary>
+        /// Год расчетного периода платежного документа
+        /// </summary>
+        public short year;
+
+        /// <summary>
+        /// Сведения о платежных реквизитах получателя платежа - бизнес-ключ поиска размещенных платежных
+        /// реквизитов в ГИС ЖКХ
+        /// </summary>
+        public PaymentInformation[] paymentInformation;
+
+        /// <summary>
+        /// Размещаемый платежный документ. Максимум 500.
+        /// </summary>
+        public PaymentDocument[] paymentDocument;
+    }
+}
diff --git a/Hcs.Client/Client/Api/Request/Bills/BillsRequestBase.cs b/Hcs.Client/Client/Api/Request/Bills/BillsRequestBase.cs
new file mode 100644
index 0000000..3021a34
--- /dev/null
+++ b/Hcs.Client/Client/Api/Request/Bills/BillsRequestBase.cs
@@ -0,0 +1,55 @@
+using Hcs.Client.Api.Request;
+using Hcs.Client.Api.Request.Adapter;
+using Hcs.Service.Async.Bills;
+using System.Threading.Tasks;
+
+namespace Hcs.Service.Async.Bills
+{
+#pragma warning disable IDE1006
+    public partial class getStateResult : IGetStateResultMany { }
+#pragma warning restore IDE1006
+
+    public partial class BillsPortsTypeAsyncClient : IAsyncClient<RequestHeader>
+    {
+        public async Task<IGetStateResponse> GetStateAsync(RequestHeader header, IGetStateRequest request)
+        {
+            return await getStateAsync(header, (getStateRequest)request);
+        }
+    }
+
+#pragma warning disable IDE1006
+    public partial class getStateResponse : IGetStateResponse
+#pragma warning restore IDE1006
+    {
+        public IGetStateResult GetStateResult => getStateResult;
+    }
+
+    public partial class AckRequestAck : IAck { }
+
+    public partial class ErrorMessageType : IErrorMessage { }
+
+#pragma warning disable IDE1006
+    public partial class getStateRequest : IGetStateRequest { }
+#pragma warning restore IDE1006
+}
+
+namespace Hcs.Client.Api.Request.Bills
+{
+    internal class BillsRequestBase(ClientBase client) :
+        RequestBase<getStateResult,
+            BillsPortsTypeAsyncClient,
+            BillsPortsTypeAsync,
+            RequestHeader,
+            AckRequestAck,
+            ErrorMessageType,
+            getStateRequest>(client)
+    {
+        protected override EndPoint EndPoint => EndPoint.BillsAsync;
+
+        protected override bool EnableMinimalResponseWaitDelay => true;
+
+        protected override bool CanBeRestarted => true;
+
+        protected override int RestartTimeoutMinutes => 20;
+    }
+}
diff --git a/Hcs.Client/Client/Api/Request/Bills/ImportPaymentDocumentRequest.cs b/Hcs.Client/Client/Api/Request/Bills/ImportPaymentDocumentRequest.cs
new file mode 100644
index 0000000..4cd29e2
--- /dev/null
+++ b/Hcs.Client/Client/Api/Request/Bills/ImportPaymentDocumentRequest.cs
@@ -0,0 +1,274 @@
+using Hcs.Client.Api.Payload.Bills;
+using Hcs.Client.Api.Request.Exception;
+using Hcs.Client.Api.Type;
+using Hcs.Client.Internal;
+using Hcs.Service.Async.Bills;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Hcs.Client.Api.Request.Bills
+{
+    internal class ImportPaymentDocumentRequest(ClientBase client) : BillsRequestBase(client)
+    {
+        protected override bool CanBeRestarted => false;
+
+        internal async Task<bool> ExecuteAsync(ImportPaymentDocumentPayload payload, CancellationToken token)
+        {
+            // TODO: Добавить проверку пейлоада
+
+            var request = GetRequestFromPayload(payload);
+            var result = await SendAndWaitResultAsync(request, async asyncClient =>
+            {
+                var response = await asyncClient.importPaymentDocumentDataAsync(CreateRequestHeader(), request);
+                return response.AckRequest.Ack;
+            }, token);
+
+            result.Items.OfType<ErrorMessageType>().ToList().ForEach(error =>
+            {
+                throw RemoteException.CreateNew(error.ErrorCode, error.Description);
+            });
+
+            result.Items.OfType<CommonResultType>().ToList().ForEach(commonResult =>
+            {
+                commonResult.Items.OfType<ErrorMessageType>().ToList().ForEach(error =>
+                {
+                    throw RemoteException.CreateNew(error.ErrorCode, error.Description);
+                });
+            });
+
+            return true;
+        }
+
+        private importPaymentDocumentRequest GetRequestFromPayload(ImportPaymentDocumentPayload payload)
+        {
+            var items = new List<object>
+            {
+                payload.month,
+                payload.year
+            };
+
+            var paymentInformations = new Dictionary<ImportPaymentDocumentPayload.PaymentInformation, importPaymentDocumentRequestPaymentInformation>();
+            foreach (var entry in payload.paymentInformation)
+            {
+                var paymentInformation = new importPaymentDocumentRequestPaymentInformation()
+                {
+                    TransportGUID = Guid.NewGuid().ToString(),
+                    BankBIK = entry.bankBIK,
+                    operatingAccountNumber = entry.operatingAccountNumber
+                };
+                paymentInformations.Add(entry, paymentInformation);
+
+                items.Add(paymentInformation);
+            }
+
+            foreach (var entry in payload.paymentDocument)
+            {
+                var chargeInfo = new List<object>();
+                foreach (var subEntry in entry.chargeInfo)
+                {
+                    if (subEntry is ImportPaymentDocumentPayload.MunicipalService municipalService)
+                    {
+                        var item = new PDServiceChargeTypeMunicipalService()
+                        {
+                            ServiceType = new nsiRef()
+                            {
+                                Code = municipalService.serviceType.Code,
+                                GUID = municipalService.serviceType.GUID
+                            },
+                            Rate = municipalService.rate,
+                            TotalPayable = municipalService.totalPayable
+                        };
+
+                        if (municipalService.moneyRecalculation.HasValue)
+                        {
+                            item.ServiceCharge = new ServiceChargeImportType()
+                            {
+                                MoneyRecalculation = municipalService.moneyRecalculation.Value,
+                                MoneyRecalculationSpecified = true
+                            };
+                        }
+                        if (municipalService.moneyDiscount.HasValue)
+                        {
+                            item.ServiceCharge ??= new ServiceChargeImportType();
+                            item.ServiceCharge.MoneyDiscount = municipalService.moneyDiscount.Value;
+                            item.ServiceCharge.MoneyDiscountSpecified = true;
+                        }
+
+                        if (municipalService.houseOverallNeedsNorm.HasValue)
+                        {
+                            item.ServiceInformation = new ServiceInformation()
+                            {
+                                houseOverallNeedsNorm = municipalService.houseOverallNeedsNorm.Value,
+                                houseOverallNeedsNormSpecified = true
+                            };
+                        }
+                        if (municipalService.individualConsumptionNorm.HasValue)
+                        {
+                            item.ServiceInformation ??= new ServiceInformation();
+                            item.ServiceInformation.individualConsumptionNorm = municipalService.individualConsumptionNorm.Value;
+                            item.ServiceInformation.individualConsumptionNormSpecified = true;
+                        }
+                        if (municipalService.individualConsumptionCurrentValue.HasValue)
+                        {
+                            item.ServiceInformation ??= new ServiceInformation();
+                            item.ServiceInformation.individualConsumptionCurrentValue = municipalService.individualConsumptionCurrentValue.Value;
+                            item.ServiceInformation.individualConsumptionCurrentValueSpecified = true;
+                        }
+                        if (municipalService.houseOverallNeedsCurrentValue.HasValue)
+                        {
+                            item.ServiceInformation ??= new ServiceInformation();
+                            item.ServiceInformation.houseOverallNeedsCurrentValue = municipalService.houseOverallNeedsCurrentValue.Value;
+                            item.ServiceInformation.houseOverallNeedsCurrentValueSpecified = true;
+                        }
+                        if (municipalService.houseTotalIndividualConsumption.HasValue)
+                        {
+                            item.ServiceInformation ??= new ServiceInformation();
+                            item.ServiceInformation.houseTotalIndividualConsumption = municipalService.houseTotalIndividualConsumption.Value;
+                            item.ServiceInformation.houseTotalIndividualConsumptionSpecified = true;
+                        }
+                        if (municipalService.houseTotalHouseOverallNeeds.HasValue)
+                        {
+                            item.ServiceInformation ??= new ServiceInformation();
+                            item.ServiceInformation.houseTotalHouseOverallNeeds = municipalService.houseTotalHouseOverallNeeds.Value;
+                            item.ServiceInformation.houseTotalHouseOverallNeedsSpecified = true;
+                        }
+
+                        var consumption = new List<PDServiceChargeTypeMunicipalServiceVolume>();
+                        if (municipalService.individualConsumptionVolumeDeterminingMethod.HasValue)
+                        {
+                            consumption.Add(new PDServiceChargeTypeMunicipalServiceVolume()
+                            {
+                                determiningMethod = municipalService.individualConsumptionVolumeDeterminingMethod.Value.ToServiceType(),
+                                determiningMethodSpecified = true,
+                                type = PDServiceChargeTypeMunicipalServiceVolumeType.I,
+                                typeSpecified = true,
+                                Value = municipalService.individualConsumptionVolumeValue.Value
+                            });
+                        }
+                        if (municipalService.overallConsumptionVolumeDeterminingMethod.HasValue)
+                        {
+                            consumption.Add(new PDServiceChargeTypeMunicipalServiceVolume()
+                            {
+                                determiningMethod = municipalService.overallConsumptionVolumeDeterminingMethod.Value.ToServiceType(),
+                                determiningMethodSpecified = true,
+                                type = PDServiceChargeTypeMunicipalServiceVolumeType.O,
+                                typeSpecified = true,
+                                Value = municipalService.overallConsumptionVolumeValue.Value
+                            });
+                        }
+                        item.Consumption = [.. consumption];
+
+                        if (municipalService.multiplyingFactorRatio.HasValue)
+                        {
+                            item.MultiplyingFactor = new PDServiceChargeTypeMunicipalServiceMultiplyingFactor()
+                            {
+                                Ratio = municipalService.multiplyingFactorRatio.Value
+                            };
+
+                            if (municipalService.amountOfExcessFees.HasValue)
+                            {
+                                item.MultiplyingFactor.AmountOfExcessFees = municipalService.amountOfExcessFees.Value;
+                                item.MultiplyingFactor.AmountOfExcessFeesSpecified = true;
+                            }
+                        }
+
+                        if (municipalService.municipalServiceIndividualConsumptionPayable.HasValue)
+                        {
+                            item.MunicipalServiceIndividualConsumptionPayable = municipalService.municipalServiceIndividualConsumptionPayable.Value;
+                            item.MunicipalServiceIndividualConsumptionPayableSpecified = true;
+                        }
+
+                        if (municipalService.municipalServiceCommunalConsumptionPayable.HasValue)
+                        {
+                            item.MunicipalServiceCommunalConsumptionPayable = municipalService.municipalServiceCommunalConsumptionPayable.Value;
+                            item.MunicipalServiceCommunalConsumptionPayableSpecified = true;
+                        }
+
+                        if (municipalService.amountOfPaymentMunicipalServiceIndividualConsumption.HasValue)
+                        {
+                            item.AmountOfPaymentMunicipalServiceIndividualConsumption = municipalService.amountOfPaymentMunicipalServiceIndividualConsumption.Value;
+                            item.AmountOfPaymentMunicipalServiceIndividualConsumptionSpecified = true;
+                        }
+
+                        if (municipalService.amountOfPaymentMunicipalServiceCommunalConsumption.HasValue)
+                        {
+                            item.AmountOfPaymentMunicipalServiceCommunalConsumption = municipalService.amountOfPaymentMunicipalServiceCommunalConsumption.Value;
+                            item.AmountOfPaymentMunicipalServiceCommunalConsumptionSpecified = true;
+                        }
+
+                        if (municipalService.accountingPeriodTotal.HasValue)
+                        {
+                            item.AccountingPeriodTotal = municipalService.accountingPeriodTotal.Value;
+                            item.AccountingPeriodTotalSpecified = true;
+                        }
+
+                        chargeInfo.Add(new PaymentDocumentTypeChargeInfo()
+                        {
+                            Item = item
+                        });
+                    }
+
+                    // TODO: Обработать ошибку
+                }
+
+                var paymentDocument = new importPaymentDocumentRequestPaymentDocument()
+                {
+                    TransportGUID = Guid.NewGuid().ToString(),
+                    Items1 = [paymentInformations[entry.paymentInformation].TransportGUID],
+                    AccountGuid = entry.accountGuid,
+                    PaymentDocumentNumber = entry.paymentDocumentNumber,
+                    Items = [.. chargeInfo]
+                };
+
+                if (entry.debtPreviousPeriods.HasValue)
+                {
+                    paymentDocument.DebtPreviousPeriods = entry.debtPreviousPeriods.Value;
+                    paymentDocument.DebtPreviousPeriodsSpecified = true;
+                }
+
+                if (entry.advanceBllingPeriod.HasValue)
+                {
+                    paymentDocument.AdvanceBllingPeriod = entry.advanceBllingPeriod.Value;
+                    paymentDocument.AdvanceBllingPeriodSpecified = true;
+                }
+
+                if (entry.totalPayableByPDWithDebtAndAdvance.HasValue)
+                {
+                    paymentDocument.TotalPayableByPDWithDebtAndAdvance = entry.totalPayableByPDWithDebtAndAdvance.Value;
+                    paymentDocument.TotalPayableByPDWithDebtAndAdvanceSpecified = true;
+                }
+
+                if (entry.totalPayableByPD.HasValue)
+                {
+                    paymentDocument.TotalPayableByPD = entry.totalPayableByPD.Value;
+                    paymentDocument.TotalPayableByPDSpecified = true;
+                }
+
+                if (entry.paidCash.HasValue)
+                {
+                    paymentDocument.PaidCash = entry.paidCash.Value;
+                    paymentDocument.PaidCashSpecified = true;
+                }
+
+                if (entry.dateOfLastReceivedPayment.HasValue)
+                {
+                    paymentDocument.DateOfLastReceivedPayment = entry.dateOfLastReceivedPayment.Value;
+                    paymentDocument.DateOfLastReceivedPaymentSpecified = true;
+                }
+
+                items.Add(paymentDocument);
+            }
+
+            // http://open-gkh.ru/Bills/importPaymentDocumentRequest.html
+            return new importPaymentDocumentRequest
+            {
+                Id = Constants.SIGNED_XML_ELEMENT_ID,
+                version = "11.2.0.16",
+                Items = [.. items]
+            };
+        }
+    }
+}
diff --git a/Hcs.Client/Client/Api/Type/MunicipalServiceVolumeDeterminingMethod.cs b/Hcs.Client/Client/Api/Type/MunicipalServiceVolumeDeterminingMethod.cs
new file mode 100644
index 0000000..cddc7f9
--- /dev/null
+++ b/Hcs.Client/Client/Api/Type/MunicipalServiceVolumeDeterminingMethod.cs
@@ -0,0 +1,33 @@
+using Hcs.Service.Async.Bills;
+using System;
+
+namespace Hcs.Client.Api.Type
+{
+    // http://open-gkh.ru/Bills/PDServiceChargeType/MunicipalService/Consumption/Volume/determiningMethod.html
+    public enum MunicipalServiceVolumeDeterminingMethod
+    {
+        Norm,
+        MeteringDevice,
+        Other
+    }
+
+    internal static class MunicipalServiceVolumeDeterminingMethodExtensions
+    {
+        internal static PDServiceChargeTypeMunicipalServiceVolumeDeterminingMethod ToServiceType(this MunicipalServiceVolumeDeterminingMethod type)
+        {
+            switch (type)
+            {
+                case MunicipalServiceVolumeDeterminingMethod.Norm:
+                    return PDServiceChargeTypeMunicipalServiceVolumeDeterminingMethod.N;
+
+                case MunicipalServiceVolumeDeterminingMethod.MeteringDevice:
+                    return PDServiceChargeTypeMunicipalServiceVolumeDeterminingMethod.M;
+
+                case MunicipalServiceVolumeDeterminingMethod.Other:
+                    return PDServiceChargeTypeMunicipalServiceVolumeDeterminingMethod.O;
+            }
+
+            throw new NotImplementedException($"Cannot convert {type} to service type");
+        }
+    }
+}
diff --git a/Hcs.Client/Client/UniClient.cs b/Hcs.Client/Client/UniClient.cs
index 189fde9..cf23e38 100644
--- a/Hcs.Client/Client/UniClient.cs
+++ b/Hcs.Client/Client/UniClient.cs
@@ -11,6 +11,8 @@ namespace Hcs.Client
     /// </summary>
     public class UniClient : ClientBase
     {
+        public BillsApi Bills => new(this);
+
         public DeviceMeteringApi DeviceMetering => new(this);
 
         public HouseManagementApi HouseManagement => new(this);
diff --git a/Hcs.Client/Hcs.Client.csproj b/Hcs.Client/Hcs.Client.csproj
index c0b9ee2..a55cb9f 100644
--- a/Hcs.Client/Hcs.Client.csproj
+++ b/Hcs.Client/Hcs.Client.csproj
@@ -65,11 +65,13 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Client\Api\ApiBase.cs" />
+    <Compile Include="Client\Api\BillsApi.cs" />
     <Compile Include="Client\Api\DeviceMeteringApi.cs" />
     <Compile Include="Client\Api\HouseManagementApi.cs" />
     <Compile Include="Client\Api\NsiApi.cs" />
     <Compile Include="Client\Api\NsiCommonApi.cs" />
     <Compile Include="Client\Api\OrgRegistryCommonApi.cs" />
+    <Compile Include="Client\Api\Payload\Bills\ImportPaymentDocumentPayload.cs" />
     <Compile Include="Client\Api\Payload\DeviceMetering\ExportMeteringDeviceHistoryPayload.cs" />
     <Compile Include="Client\Api\Payload\HouseManagement\ImportAccountDataPayload.cs" />
     <Compile Include="Client\Api\Payload\HouseManagement\ImportContractDataPayload.cs" />
@@ -90,6 +92,8 @@
     <Compile Include="Client\Api\Request\Adapter\IGetStateResult.cs" />
     <Compile Include="Client\Api\Request\Adapter\IGetStateResultMany.cs" />
     <Compile Include="Client\Api\Request\Adapter\IGetStateResultOne.cs" />
+    <Compile Include="Client\Api\Request\Bills\BillsRequestBase.cs" />
+    <Compile Include="Client\Api\Request\Bills\ImportPaymentDocumentRequest.cs" />
     <Compile Include="Client\Api\Request\DeviceMetering\DeviceMeteringRequestBase.cs" />
     <Compile Include="Client\Api\Request\DeviceMetering\ExportMeteringDeviceHistory.cs" />
     <Compile Include="Client\Api\Request\DeviceMetering\ImportMeteringDeviceValuesRequest.cs" />
@@ -125,6 +129,7 @@
     <Compile Include="Client\Api\Request\Exception\RestartTimeoutException.cs" />
     <Compile Include="Client\Api\Request\RequestHelper.cs" />
     <Compile Include="Client\Api\Request\X509Tools.cs" />
+    <Compile Include="Client\Api\Type\MunicipalServiceVolumeDeterminingMethod.cs" />
     <Compile Include="Client\Internal\CertificateHelper.cs" />
     <Compile Include="Client\Logger\ActionLogger.cs" />
     <Compile Include="Client\Logger\ConsoleLogger.cs" />
@@ -1121,6 +1126,7 @@
     <WCFMetadataStorage Include="Connected Services\Service.Async.Nsi\" />
     <WCFMetadataStorage Include="Connected Services\Service.Async.OrgRegistryCommon\" />
   </ItemGroup>
+  <ItemGroup />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
diff --git a/Hcs.TestApp/Hcs.TestApp.csproj b/Hcs.TestApp/Hcs.TestApp.csproj
index 6f5d2b9..792f1f2 100644
--- a/Hcs.TestApp/Hcs.TestApp.csproj
+++ b/Hcs.TestApp/Hcs.TestApp.csproj
@@ -70,6 +70,7 @@
   <ItemGroup>
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="TestApp\Program.cs" />
+    <Compile Include="TestApp\Scenario\BillsScenario.cs" />
     <Compile Include="TestApp\Scenario\DeviceMeteringScenario.cs" />
     <Compile Include="TestApp\Scenario\HouseManagementScenario.cs" />
     <Compile Include="TestApp\Scenario\NsiCommonScenario.cs" />
diff --git a/Hcs.TestApp/TestApp/Program.cs b/Hcs.TestApp/TestApp/Program.cs
index e64a3ba..985e3c7 100644
--- a/Hcs.TestApp/TestApp/Program.cs
+++ b/Hcs.TestApp/TestApp/Program.cs
@@ -36,6 +36,7 @@ namespace Hcs.TestApp
 
             client.SetSigningCertificate(cert);
 
+            var billsScenario = new BillsScenario(client);
             var deviceMeteringScenario = new DeviceMeteringScenario(client);
             var houseManagementScenario = new HouseManagementScenario(client);
             var nsiScenario = new NsiScenario(client);
@@ -43,6 +44,8 @@ namespace Hcs.TestApp
             var orgRegistryCommonScenario = new OrgRegistryCommonScenario(client);
             try
             {
+                //billsScenario.ImportPaymentDocument();
+
                 //deviceMeteringScenario.ExportMeteringDeviceHistory();
                 //deviceMeteringScenario.ImportMeteringDeviceValues();
 
diff --git a/Hcs.TestApp/TestApp/Scenario/BillsScenario.cs b/Hcs.TestApp/TestApp/Scenario/BillsScenario.cs
new file mode 100644
index 0000000..f017095
--- /dev/null
+++ b/Hcs.TestApp/TestApp/Scenario/BillsScenario.cs
@@ -0,0 +1,67 @@
+using Hcs.Client;
+using Hcs.Client.Api.Payload.Bills;
+using Hcs.Client.Api.Registry;
+using Hcs.Client.Api.Type;
+using System;
+
+namespace Hcs.TestApp.Scenario
+{
+    internal class BillsScenario(UniClient client)
+    {
+        private readonly UniClient client = client;
+
+        internal void ImportPaymentDocument()
+        {
+            var paymentInformation = new ImportPaymentDocumentPayload.PaymentInformation()
+            {
+                bankBIK = "049805609",
+                operatingAccountNumber = "40602810276000100228"
+            };
+            var payload = new ImportPaymentDocumentPayload()
+            {
+                month = 8,
+                year = 2025,
+                paymentInformation = [paymentInformation],
+                paymentDocument = [new ImportPaymentDocumentPayload.PaymentDocument()
+                {
+                    paymentInformation = paymentInformation,
+                    accountGuid = "019917a8-6eb6-74cc-99b7-58350127ac50",
+                    paymentDocumentNumber = "23900701600162023",
+                    chargeInfo =
+                    [
+                        new ImportPaymentDocumentPayload.MunicipalService()
+                        {
+                            moneyRecalculation = 0M,
+                            moneyDiscount = 0M,
+                            houseOverallNeedsNorm = 0M,
+                            individualConsumptionNorm = 0.472M,
+                            individualConsumptionCurrentValue = 0M,
+                            houseOverallNeedsCurrentValue = 0M,
+                            houseTotalIndividualConsumption = 19.678M,
+                            houseTotalHouseOverallNeeds = 0M,
+                            individualConsumptionVolumeDeterminingMethod = MunicipalServiceVolumeDeterminingMethod.Norm,
+                            individualConsumptionVolumeValue = 1.006M,
+                            municipalServiceIndividualConsumptionPayable = 1862.93M,
+                            municipalServiceCommunalConsumptionPayable = 0M,
+                            amountOfPaymentMunicipalServiceIndividualConsumption = 1862.93M,
+                            amountOfPaymentMunicipalServiceCommunalConsumption = 0M,
+                            serviceType = Registry3.Element6,
+                            rate = 1851.82M,
+                            totalPayable = 1862.93M,
+                            accountingPeriodTotal = 1862.93M
+                        }
+                    ],
+                    debtPreviousPeriods = 3271.16M,
+                    advanceBllingPeriod = 0M,
+                    totalPayableByPDWithDebtAndAdvance = 3043.95M,
+                    totalPayableByPD = 3442.24M,
+                    paidCash = 3669.45M,
+                    dateOfLastReceivedPayment = new DateTime(2025, 8, 30)
+                }]
+            };
+
+            var result = client.Bills.ImportPaymentDocumentAsync(payload).Result;
+            Console.WriteLine("Scenario execution " + (result ? "succeeded" : "failed"));
+        }
+    }
+}