curl --request GET \
  --url https://sandbox.tight.com/v6/invoicing/setup \
  --header 'Authorization: Bearer <token>'

{
  "result": "SUCCESS",
  "data": {
    "brandColor": "4A90D9",
    "defaultNote": "Thank you for your business!",
    "defaultTerm": {
      "type": "NET_30",
      "dueDate": "2025-07-26"
    },
    "defaultReminderRecurrence": {
      "frequency": "WEEKLY",
      "interval": 1
    },
    "reimbursableMarkUpPercent": "15.0",
    "setupComplete": true
  }
}