curl --request POST \
  --url https://api.notifly.tech/projects/{projectId}/user-journeys/{userJourneyId}/enter \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '{
  "users": [
    {
      "userId": "alice"
    }
  ]
}'

{
  "code": 200,
  "success": true,
  "error": null
}