Verify Passkey Registration

curl --request POST \
  --url https://api.authsignal.com/v1/client/user-authenticators/passkey \
  --header 'Content-Type: application/json' \
  --data '{
  "challengeId": "<string>",
  "registrationCredential": {}
}'

{
  "isVerified": true,
  "accessToken": "<string>",
  "userAuthenticatorId": "<string>"
}