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

# ApproveBillRequestValidator

Enforces the single precondition for bill approval requests: the target bill, looked up via `IBillQueryProvider`, must currently carry the `"REV"` (review) status code before an `ApproveBillRequest` is allowed to proceed. It queries `IBillQueryProvider.GetBill` at validation time rather than relying on any value already present on the request DTO, so the check reflects the bill's live status.

## Purpose
- Rejects approval requests for bills that are not in `"REV"` status by validating `BillId` against a live lookup via `IBillQueryProvider.GetBill`.
- Prevents approving a bill more than once or out of its expected workflow stage.

## Context
- Namespace: `SAIF.Services.Claims.Bills.Validators`
- Assembly/package: `SAIF.Services` (packaged inside the `SAIF.SAIFCode.Core` NuGet package)

## Public members
| Member | Signature | Purpose |
| --- | --- | --- |
| ApproveBillRequestValidator | `ApproveBillRequestValidator(IBillQueryProvider queryProvider)` | Wires a rule requiring `BillId` to resolve, via `queryProvider.GetBill`, to a bill whose `BillStatus.Code` equals `"REV"`.* |

## Behavioral notes
- Validation is enforced via FluentValidation's `AbstractValidator<T>` base.*
- The `Must` predicate performs a database-backed lookup (`queryProvider.GetBill`) as part of validation rather than checking a value on the request itself, so the rule's outcome depends on external state at validation time.*

## Constraints and usage notes
- Requires an `IBillQueryProvider` implementation to be supplied via constructor injection; the validator cannot function without a bill data source.

> **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
- Services/SAIF.Services/Claims/Bills/Validators/ApproveBillRequestValidator.cs