{
  "name": "Required Tip",
  "type": "GRATUITY",
  "price": {
    "type": "ESTIMATE",
    "amount": {
      "currencyCode": "USD",
      "units": "3",
      "nanos": 100000000
    }
  },
  "gratuityExtension": {
    "gratuityType": "MANDATORY"
  }
}