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lang: en
title: 'API docs: authentication.authentication_metadata_method_key'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/authentication
permalink: /doc/en/lb4/apidocs.authentication.authentication_metadata_method_key.html
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[Home](./index.md) > [@loopback/authentication](./authentication.md) > [AUTHENTICATION\_METADATA\_METHOD\_KEY](./authentication.authentication_metadata_method_key.md)
## AUTHENTICATION\_METADATA\_METHOD\_KEY variable
The key used to store method-level metadata for `@authenticate`
<b>Signature:</b>
```typescript
AUTHENTICATION_METADATA_METHOD_KEY: MetadataAccessor<AuthenticationMetadata, MethodDecorator>
```