curl -L -X POST 'https://apis.roblox.com/cloud/v2/users/{user}/notifications' \
  -H 'x-api-key: {your-api-key}' \
  --data '{ \
  "source": { \
    "universe": "universes/96623001" \
  }, \
  "payload": { \
    "type": "TYPE_UNSPECIFIED", \
    "messageId": "5dd7024b-68e3-ac4d-8232-4217f86ca244", \
    "parameters": { \
      "key": { \
        "stringValue": "bronze egg" \
      } \
    }, \
    "joinExperience": { \
      "launchData": "Launch Data" \
    }, \
    "analyticsData": { \
      "category": "Bronze egg hatched" \
    } \
  } \
}'

{
  "path": "users/123/notifications/01234567-ABCD-1234-ABCD-0123456789AB",
  "id": "a6746f2e-2cc6-11ee-be56-0242ac120002"
}