# Initiate WebAuthn Authentication (beta)

**POST /v1/auth/webauthn/authentication/begin**

Initiate a WebAuthn authentication request. This endpoint requires that a user has at least one WebAuthn credential attached for the provided `domain` from a successful `CreateWebAuthnRegistration`. Pass the JSON object in `public_key_credential_request_options` property into `await get(options)` as `options` if you are using [webauthn-json](https://github.com/github/webauthn-json) or to [navigator.credentials.get(options)](https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get).

## HTTP Request

`POST /v1/auth/webauthn/authentication/begin`

## Returns

A successful response returns a `public_key_credential_request_options` property and `user_id` property.


## Servers
- Production: https://api.moonkey.fun (Production)


## Authentication methods
- Authorization


## Parameters



## Body parameters
Content-type: application/json

- **domain** (string)
  `Required` Domain of the app that will be using WebAuthn to authenticate user.
- **user_id** (string)
  `Required` User ID of the user to initiate WebAuthn credential authentication.

## Responses
### 200: OK

#### Body Parameters: application/json (object)
- **public_key_credential_request_options** (object)
  
- **user_id** (string)
  


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