curl --request POST \
  --url https://api.flowmod.ai/group/create/{instanceName} \
  --header 'Content-Type: application/json' \
  --header 'apikey: <api-key>' \
  --data '
{
  "subject": "My New Group",
  "participants": [
    "5511999999999",
    "5511888888888"
  ],
  "description": "This is a test group",
  "promoteParticipants": false
}
'

{
  "status": 201,
  "error": false,
  "response": {
    "id": "<string>",
    "subject": "<string>",
    "owner": "<string>",
    "participants": [
      {
        "id": "<string>",
        "admin": "superadmin"
      }
    ],
    "desc": "<string>",
    "creation": 123,
    "size": 123
  }
}