curl --request POST \
  --url https://api.sandbox.co.in/gst/compliance/tax-payer/gstrs/preference \
  --header 'Authorization: <authorization>' \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <x-api-key>' \
  --data '{
  "fy": "2020-21",
  "gstin": "27COWPR1617C2ZN",
  "preference": "M",
  "quarter": "Q2"
}'

{
  "code": 200,
  "data": {
    "error": {
      "error_cd": "GSTN-EXEC2003",
      "message": "Something seems to have gone wrong while processing your request. Please try again. If error persists quote error number GSTN-EXEC2003 when you contact customer care for quick resolution "
    },
    "status_cd": "0"
  },
  "timestamp": 1655494089128,
  "transaction_id": "189071f9-671d-4f1d-a89e-55c19bec7002"
}