package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://api.sandbox.{id}.gr4vy.app/flows/{flow}"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("Authorization", "Bearer <token>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}

{
  "items": [
    {
      "type": "rule",
      "id": "fe26475d-ec3e-4884-9553-f7356683f7f9",
      "merchant_account_id": "default",
      "description": "example rule.",
      "flow": "checkout",
      "action": "select-payment-options",
      "conditions": [
        {
          "name": "amount",
          "operator": "less_than",
          "value": {
            "Amount condition value": {
              "value": {
                "description": "example amount value.",
                "currency": "USD",
                "value": 100
              }
            }
          }
        }
      ],
      "outcome": {
        "type": "card-routing",
        "result": [
          {
            "payment_service_id": "fe26475d-ec3e-4884-9553-f7356683f7f9",
            "instrument\"": "network_token",
            "transformations": []
          },
          {
            "payment_service_id": "d88aca32-07fb-46cd-a43f-86da02b73c21",
            "instrument": "pan",
            "transformations": [
              {
                "name": "force_mit"
              }
            ]
          }
        ],
        "version": 2
      },
      "position": 2,
      "created_at": "2013-07-16T19:23:00.000+00:00",
      "updated_at": "2013-07-16T19:23:00.000+00:00",
      "error_code": "flow_error_code"
    }
  ]
}