curl --request GET \
  --url https://api.sandbox.co.in/gst/compliance/tax-payer/gstrs/gstr-1/at/{year}/{month} \
  --header 'Authorization: <authorization>' \
  --header 'x-api-key: <x-api-key>'

{
  "code": 200,
  "data": {
    "error": {
      "error_cd": "RET11416",
      "message": "No document found in selected financial year. Either this document exists in a different financial year or the document number is incorrect."
    },
    "status_cd": "0"
  },
  "timestamp": 1763446641000,
  "transaction_id": "9e1608fe-372a-4064-94bc-4657473700f1"
}