Add Passkey Registration Link

Deprecated: use user service v2 RegisterPasskey instead.

Adds a new passkey authenticator link to the user and returns it in the response. The link enables the user to register a new device if current passkey devices are all platform authenticators. e.g. User has already registered Windows Hello and wants to register FaceID on the iPhone.

curl -X POST "https://loading/users/string/passwordless/_link"

{
  "details": {
    "sequence": 0,
    "creationDate": "2023-01-15T01:30:15.01Z",
    "changeDate": "2023-01-15T01:30:15.01Z",
    "resourceOwner": "string"
  },
  "link": "string",
  "expiration": "string"
}