---
title: IBillPaymentService
summary: API reference for IBillPaymentService.
status: draft
owner: SAIF Doc Gen
last_reviewed: 2026-09-24
library: SAIF.SAIFCode.Core
reference_type: package
---

# IBillPaymentService

`IBillPaymentService` declares a service contract in the Legal / Bills area, implemented outside this library (most likely in SAIF.Services, per the declare-here, enforce-elsewhere pattern documented for this library)*.

## Purpose
- Declares the operations that a SAIF.Services implementation must provide for the Legal / Bills area*.

## Context
- Namespace: `SAIF.Core.Contracts.Legal.Bills`
- Kind: Interface
- Assembly/package: `SAIF.Core` (NuGet package `SAIF.SAIFCode.Core`)

## Public members
| Member | Signature | Purpose |
| --- | --- | --- |
| `GenerateZeroPaymentLetters` | `long GenerateZeroPaymentLetters(ZeroPaymentBatchArguments batchArguments)` | Generates zero payment letters, given `batchArguments`*. |
| `GetAttorneysWithPendingLegalBills` | `IList<AttorneyNotificationRequest> GetAttorneysWithPendingLegalBills()` | Returns attorneys with pending legal bills*. |
| `ReturnBillPayment` | `Task<long> ReturnBillPayment(long billId, IMessageContainer messageContainer)` | Handles return bill payment, given `billId`, `messageContainer`*. |

> **Note:** Statements marked with `*` were inferred from code structure, naming
> conventions, or contextual evidence where direct confirmation was not available
> in source artifacts. Statements marked with `**` could not be confirmed; treat
> as unknown until verified.

## Sources
- Core/SAIF.Core/Contracts/Legal/Bills/IBillPaymentService.cs