# IBillingService

- File ID: file:rfn6bc:ibillingservice-cs
- Path: NexusReader.Application/Abstractions/Services/IBillingService.cs
- Role: service
- Layer: application

## Purpose

Defines an application-layer billing service abstraction that declares handlers for subscription updates and deletions (used by infrastructure implementations to react to Stripe/customer events).

## Key Details

Pure interface in the Application.Abstractions layer; no runtime behavior here—concrete implementations will perform persistence, external calls, mapping, and error handling and return FluentResults.Result.

## Symbols

- IBillingService: Defines an application-layer billing service abstraction that declares handlers for subscription updates and deletions (used by infrastructure implementations to react to Stripe/customer events).
- HandleSubscriptionUpdatedAsync(): Contract for handling when a customer's subscription is created or updated (by Stripe or equivalent).
- HandleSubscriptionDeletedAsync(): Contract for handling when a customer's subscription is deleted (cleanup or downgrade actions).
- IBillingService: Abstraction exposing billing/subscription lifecycle handlers to be implemented by infrastructure or application services.

## Dependencies

- No resolved dependencies.

## Calls

- No resolved calls.

## Unresolved References

- dependency-target: NexusReader.Domain.Entities (using)
- dependency-target: FluentResults (using)

## Coverage

- Symbols: 4
- Executable symbols: 2
- Executable symbols with control flow: 2
- Grounded edges: 4
- Unresolved references: 2
- Control-flow fragments: 2
- Unresolved jumps: 0
- Unsupported constructs: 0
- Control-flow coverage: 100%
- Required diagrams: 2
- Generated diagrams: 2

## Control Flow Fragments

- HandleSubscriptionUpdatedAsync: 3 nodes, 2 edges, 0 jumps, 0 unsupported constructs
- HandleSubscriptionDeletedAsync: 3 nodes, 2 edges, 0 jumps, 0 unsupported constructs

## Diagrams

### IBillingService Neighborhood

```mermaid
flowchart LR
    class_qlxnhj_ibillingservice("IBillingService")
    file_rfn6bc_ibillingservice_cs("IBillingService")
    method_16n7wyr_handlesubscriptiondeletedasync[["HandleSubscriptionDeletedAsync()"]]
    method_1px2su2_handlesubscriptionupdatedasync[["HandleSubscriptionUpdatedAsync()"]]
    type_dvqqtf_ibillingservice[/"IBillingService"/]
```

### IBillingService Execution Overview

```mermaid
flowchart TD
    class_qlxnhj_ibillingservice("IBillingService")
    method_16n7wyr_handlesubscriptiondeletedasync[["HandleSubscriptionDeletedAsync()"]]
    method_1px2su2_handlesubscriptionupdatedasync[["HandleSubscriptionUpdatedAsync()"]]
    class_qlxnhj_ibillingservice -->|contains| method_16n7wyr_handlesubscriptiondeletedasync
    class_qlxnhj_ibillingservice -->|contains| method_1px2su2_handlesubscriptionupdatedasync
```

## Diagram Validation

- Status: pass
