curl --request GET \
  --url https://api.grailpay.com/3p/api/v2/merchants/{uuid}/billing \
  --header 'Authorization: Bearer <token>'

{
  "status": true,
  "message": "",
  "data": {
    "summary": [
      {
        "billable_event": "Standard ACH",
        "total": 1500,
        "total_occurrences": 150,
        "amount_per_occurrence": 10
      }
    ]
  },
  "errors": null,
  "error_code": null
}