# Initiate WebAuthn Registration (beta)

**POST /v1/auth/webauthn/registrations/begin**

Initiate a WebAuthn Registration Request. This endpoint requires that a user already exists on MoonKey. Pass the returned JSON object in `public_key_credential_creation_options` property into `await create(options)` as `options` if you are using [webauthn-json](https://github.com/github/webauthn-json) or to [navigator.credentials.create(options)](https://w3c.github.io/webappsec-credential-management/#algorithm-create-cred).

## HTTP Request

`POST /v1/auth/webauthn/registrations/begin`

## Returns

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


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


## Authentication methods
- Authorization


## Parameters



### Body: application/json (object)

- **domain** (string)
  `Required` Domain of the app that will be using WebAuthn to provide user sign in.
- **user_id** (string)
  `Required` User ID of the user to attach this WebAuthn registration to.
- **authenticator_type** (string)
  `Optional` The intended authenticator type for the WebAuthn device used. `cross-platform` is recommended for portable WebAuthn device like YubiKey and `platform` if you want to enable log in via platform specific methods such as FaceID or TouchID. Possible values: platform, cross-platform. Defaults to platform. 


## Responses
### 200
OK

#### Body: application/json (object)
- **public_key_credential_creation_options** (object)

- **user_id** (string)



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