curl --request POST \
  --url https://api.kraken.com/v0/insto/custody/tasks/{task_id}/review \
  --header 'Content-Type: application/json' \
  --header 'api-key: <api-key>' \
  --header 'api-nonce: <api-key>' \
  --header 'api-otp: <api-key>' \
  --header 'api-sign: <api-key>' \
  --data '
{
  "type": "approve",
  "comment": "Transaction approved by finance team"
}
'

import requests

url = "https://api.kraken.com/v0/insto/custody/tasks/{task_id}/review"

payload = {
    "type": "approve",
    "comment": "Transaction approved by finance team"
}
headers = {
    "api-key": "<api-key>",
    "api-sign": "<api-key>",
    "api-nonce": "<api-key>",
    "api-otp": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'api-key': '<api-key>',
    'api-sign': '<api-key>',
    'api-nonce': '<api-key>',
    'api-otp': '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({type: 'approve', comment: 'Transaction approved by finance team'})
};

fetch('https://api.kraken.com/v0/insto/custody/tasks/{task_id}/review', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

package main

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

func main() {

	url := "https://api.kraken.com/v0/insto/custody/tasks/{task_id}/review"

	payload := strings.NewReader("{\n  \"type\": \"approve\",\n  \"comment\": \"Transaction approved by finance team\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("api-key", "<api-key>")
	req.Header.Add("api-sign", "<api-key>")
	req.Header.Add("api-nonce", "<api-key>")
	req.Header.Add("api-otp", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

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

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

	fmt.Println(string(body))

}

{
  "state": "approved"
}

{
  "type": "tag:kraken.com,2025:BadRequest",
  "status": 400,
  "title": "Bad Request",
  "data": {
    "message": "type must be approve or deny"
  },
  "detail": "Request failed validation: type must be approve or deny.",
  "instance": "https://debug.kraken.com/req/01HXYZABCDEF"
}

{
  "type": "tag:kraken.com,2025:PermissionDenied",
  "status": 403,
  "title": "Forbidden",
  "data": {
    "message": "caller has already voted on this task"
  },
  "detail": "Caller is not an assigned reviewer for this task.",
  "instance": "https://debug.kraken.com/req/01HXYZABCDEF"
}

{
  "type": "tag:kraken.com,2025:gateway/ReadUpstream",
  "status": 500,
  "title": "Internal Server Error",
  "data": "<unknown>",
  "detail": "Failed to read upstream response from custody service.",
  "instance": "https://debug.kraken.com/req/01HXYZABCDEF"
}

{
  "type": "tag:kraken.com,2025:gateway/Connect",
  "status": 503,
  "title": "Service Unavailable",
  "data": "<unknown>",
  "detail": "Failed to connect to upstream custody service.",
  "instance": "https://debug.kraken.com/req/01HXYZABCDEF"
}