curl --request POST \
  --url https://{host}/me/v1/authentication-methods \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "type": "passkey",
  "connection": "<string>",
  "identity_user_id": "<string>"
}
'

{
  "auth_session": "<string>",
  "authn_params_public_key": {
    "challenge": "<string>",
    "pubKeyCredParams": [
      {
        "type": "public-key",
        "alg": -8
      },
      {
        "type": "public-key",
        "alg": -7
      },
      {
        "type": "public-key",
        "alg": -257
      }
    ],
    "rp": {
      "name": "<string>",
      "id": "<string>"
    },
    "user": {
      "id": "<string>",
      "name": "<string>",
      "displayName": "<string>"
    },
    "authenticatorSelection": {
      "residentKey": "required",
      "userVerification": "required"
    },
    "timeout": 60000
  }
}