curl --request POST \
  --url https://api.sandbox.co.in/bank/virtual/accounts/{account_number}/payments/payin/upi/generate-static-qr \
  --header 'Content-Type: application/json' \
  --data '{}'

{
  "timestamp": 123,
  "transaction_id": "<string>",
  "data": {
    "qr_string": "<string>"
  },
  "code": 123
}