curl --location --request POST '/gateway/base/biz' \
--header 'method: pay' \
--header 'signType: SHA512' \
--header 'serviceName: api.pay' \
--header 'mchId: 202510311984218917904478208' \
--header 'timestamp: 1631671670' \
--header 'sign: 32554324534545432543' \
--header 'Content-Type: application/json' \
--data-raw '{
"mchOrderId": "16813971308HUdd",
"amount": "100.00",
"currency": "INR",
"productinfo": "tdaypay",
"clientIp": "127.0.0.1",
"firstname": "Dungala Bhaskar",
"lastname": "Dungala Bhaskar",
"email": "demo@gmail.com",
"phone": "7006838444",
"callbackUrl": "https://127.0.0.1/api/"
}'