User TOTP credential model

{
    "user_id": string,
    "created_at": number,
    "key": string
}

• user_id: A 24-character long user ID.
• created_at: A 64-bit integer as an UNIX timestamp representing when the credential was created.
• key: A base64-encoded 20 byte key.

Example

{
    "user_id": "vg6avv9dp7jvh36f8grjtpsj",
    "created_at": 1728783738,
    "key": "nHKsL9EFvdzuTWMzGCjZgZWojpU="
}