curl --request GET \
  --url https://api.withorb.com/v1/customers/external_customer_id/{external_customer_id}/credits \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "id": "<string>",
      "balance": 123,
      "effective_date": "2023-11-07T05:31:56Z",
      "expiry_date": "2023-11-07T05:31:56Z",
      "per_unit_cost_basis": "<string>",
      "status": "active",
      "maximum_initial_balance": 123
    }
  ],
  "pagination_metadata": {
    "has_more": true,
    "next_cursor": "<string>"
  }
}