curl --request POST \
  --url https://api.sandbox.co.in/gst/compliance/e-invoice/tax-payer/gstin/search \
  --header 'Content-Type: application/json' \
  --header 'authorization: <api-key>' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "gstin": "29AAACQ3770E000"
}
'

{
  "code": 200,
  "data": {
    "Data": {
      "AddrBnm": null,
      "AddrBno": null,
      "AddrFlno": null,
      "AddrLoc": null,
      "AddrPncd": 560009,
      "AddrSt": null,
      "BlkStatus": "U",
      "DtDReg": null,
      "DtReg": null,
      "Gstin": "29AAACQ3770E000",
      "LegalName": "Acme Industries Private Limited",
      "StateCode": 0,
      "Status": "ACT",
      "TradeName": null,
      "TxpType": "REG"
    },
    "ErrorDetails": null,
    "InfoDtls": null,
    "Status": 1
  },
  "timestamp": 1763446641000,
  "transaction_id": "7e7d3212-4a44-4c75-8a2a-39b34d4a826f"
}