curl --request POST \
  --url https://api.sandbox.co.in/gst/compliance/tax-payer/otp/verify \
  --header 'Content-Type: application/json' \
  --header 'authorization: <api-key>' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "username": "{{username}}",
  "gstin": "{{gstin}}"
}
'

{
  "code": 200,
  "data": {
    "access_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ0YXhwYXllci1zZXNzaW9uIiwiZ3N0aW4iOiIyNEFCS0NTMjAzM0IxWlYiLCJpYXQiOjE3MTI5NDQxMDAsImV4cCI6MTcxMjk0NzcxMX0.sandbox-signature",
    "session_expiry": 1712947711000,
    "status_cd": "1",
    "token_expiry": 1712947711000
  },
  "timestamp": 1712926110000,
  "transaction_id": "f6a85bd7-6d53-4e60-b4a7-480d3738ff0c"
}