Refund Payments made to a Customer Identifier

curl -u [YOUR_KEY_ID]:[YOUR_KEY_SECRET] \
-X POST https://api.razorpay.com/v1/payments/pay_E54n391WnEAV9H/refund \
-H "Content-Type: application/json" \
-d '{
  "amount": 100,
  "notes": {
    "key_1": "value1",
    "key_2": "value2"
  }
}'
```json: Response
{
  "id": "rfnd_E6j36ZEKvsWsEn",
  "entity": "refund",
  "amount": 100,
  "currency": "INR",
  "payment_id": "pay_E54n391WnEAV9H",
  "notes": {
    "key_1": "value1",
    "key_2": "value2"
  },
  "receipt": null,
  "acquirer_data": {
    "rrn": null
  },
  "created_at": 1579522301
}