curl --request POST \
  --url https://api.replyke.com/api/v6/:projectId/api/v7/spaces/:spaceId/join

{
  "message": "<string>",
  "membership": {
    "id": "<string>",
    "spaceId": "<string>",
    "userId": "<string>",
    "role": "<string>",
    "status": "<string>",
    "joinedAt": "<string>"
  }
}