Finish MFA Registration

curl --request POST \
  --url https://passkeys.hanko.io/{tenant_id}/mfa/registration/finalize \
  --header 'Content-Type: application/json' \
  --header 'apiKey: <apikey>' \
  --data '{
  "id": "<string>",
  "type": "public-key",
  "rawId": "<string>",
  "authenticatorAttachment": "cross-platform",
  "response": {
    "clientDataJSON": "<string>",
    "attestationObject": "<string>",
    "transports": [
      "<string>"
    ]
  },
  "transports": [
    "<string>"
  ]
}'

{
  "token": "<string>"
}