curl --request POST \
  --url https://api.magne.app/v1/keys \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "deviceId": "<string>",
  "identityKey": "<string>",
  "signedPreKey": {
    "keyId": 123,
    "publicKey": "<string>",
    "signature": "<string>"
  },
  "oneTimePreKeys": [
    {
      "keyId": 123,
      "publicKey": "<string>"
    }
  ]
}
'

{
  "message": "<string>"
}