curl --request GET \
  --url https://roughy-api-staging.fly.dev/api/v1/credits/history \
  --header 'Authorization: Bearer <token>'

{
  "items": [
    {
      "created_at": "2026-05-02T08:54:52.423000Z",
      "delta": 5000,
      "grant_id": "019de7e5-d517-7461-93d3-2d7d66f52f30",
      "id": "019de7e5-d517-7461-93d3-2d7d66f52f30",
      "stripe_invoice_id": "in_1TSZK0IasIn8pvgqzjVClKcj",
      "type": "topup"
    },
    {
      "created_at": "2026-05-02T08:54:55.020000Z",
      "delta": -415,
      "id": "019de810-1a87-72cc-b8bf-f9132aa07e91",
      "pipeline_id": "019de810-1a87-72cc-b8bf-f9132aa07e91",
      "type": "hold"
    }
  ],
  "limit": 50,
  "offset": 0,
  "total": 2
}