curl -u [YOUR_KEY_ID]:[YOUR_KEY_SECRET] \
-X PATCH https://api.razorpay.com/v1/refunds/rfnd_DfjjhJC6eDvUAi \
-H 'Content-Type: application/json' \
-d '{
    "notes": {
      "notes_key_1":"Beam me up Scotty.",
      "notes_key_2":"Engage"
    }
}'

RazorpayClient razorpay = new RazorpayClient("[YOUR_KEY_ID]", "[YOUR_KEY_SECRET]");

String refundId = "rfnd_DfjjhJC6eDvUAi";

JSONObject refundRequest = new JSONObject();
JSONObject notes = new JSONObject();
notes.put("notes_key_1","Tea, Earl Grey, Hot");
notes.put("notes_key_2","Tea, Earl Grey… decaf.");
refundRequest.put("notes",notes);

Refund refund = razorpay.refunds.edit(refundId,refundRequest);

$api = new Api($key_id, $secret);

$api->refund->fetch($refundId)->edit(array('notes'=> array('notes_key_1'=>'Beam me up Scotty.', 'notes_key_2'=>'Engage')));

import razorpay
client = razorpay.Client(auth=("YOUR_ID", "YOUR_SECRET"))

client.refund.edit(refundId,{
  "notes": {
    "notes_key_1": "Beam me up Scotty.",
    "notes_key_2": "Engage"
  }
})

import ( razorpay "github.com/razorpay/razorpay-go" )
client := razorpay.NewClient("YOUR_KEY_ID", "YOUR_SECRET")

data:= map[string]interface{}{
  "notes": map[string]interface{}{
    "notes_key_1":"Beam me up Scotty.",
    "notes_key_2":"Engage",
  },
}

body, err := client.Refund.Update("<refundId>", data, nil)

var instance = new Razorpay({ key_id: 'YOUR_KEY_ID', key_secret: 'YOUR_SECRET' })

instance.refunds.edit(refundId,{
  "notes": {
    "notes_key_1": "Beam me up Scotty.",
    "notes_key_2": "Engage"
  }
}) 

require "razorpay"
Razorpay.setup('YOUR_KEY_ID', 'YOUR_SECRET')

refundId = "rfnd_DfjjhJC6eDvUAi"

para_attr = {
  "notes": {
    "notes_key_1": "Beam me up Scotty.",
    "notes_key_2": "Engage"
  }
}

Razorpay::Refund.fetch(refundId).edit(para_attr)

//initialize the SDK client
RazorpayClient client = new RazorpayClient("[YOUR_KEY_ID]", "[YOUR_KEY_SECRET]");

string refundId = "rfnd_Z6t7VFTb9xHeOs";

Dictionary<string, object> refundRequest = new Dictionary<string, object>();
Dictionary<string, object> notes = new Dictionary<string, object>();
notes.Add("notes_key_1", "Tea, Earl Grey, Hot update");
notes.Add("notes_key_2", "Tea, Earl Grey… decaf.");
refundRequest.Add("notes", notes);

Refund refund = client.Refund.Fetch(refundId).Edit(refundRequest);

razorpay refunds update rfnd_ABC123 --note key1="Updated note" --note key2="Another note"

{
  "id": "`rfnd_DfjjhJC6eDvUAi`",
  "entity": "refund",
  "amount": 300100,
  "currency": "INR",
  "payment_id": "pay_FIKOnlyii5QGNx",
  "notes": {
    "notes_key_1": "Beam me up Scotty.",
    "notes_key_2": "Engage"
  },
  "receipt": null,
  "acquirer_data": {
    "arn": "10000000000000"
  },
  "created_at": 1597078124,
  "batch_id": null,
  "status": "processed",
  "speed_processed": "normal",
  "speed_requested": "optimum"
}

{
  "error": {
      "code": "BAD_REQUEST_ERROR",
      "description": "{rfnd_id} is not a valid id",
      "source": "business",
      "step": "payment_initiation",
      "reason": "input_validation_failed",
      "metadata": {}
  }
}