curl --request POST \
  --url https://api.hubapi.com/settings/v3/users/ \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "email": "newUser@email.com",
  "roleId": "100",
  "primaryTeamId": "101",
  "secondaryTeamIds": [
    "102"
  ],
  "sendWelcomeEmail": "true"
}'

{
  "id": "123",
  "email": "newUser@email.com",
  "roleId": "100",
  "primaryTeamId": "101",
  "secondaryTeamIds": [
    "102"
  ],
  "superAdmin": "false"
}