curl --request POST \
  --url https://openplatform.gateapi.io/payment/open/institution/v1/pay/checkout/order \
  --header 'Content-Type: application/json' \
  --header 'X-GatePay-Certificate-ClientId: <x-gatepay-certificate-clientid>' \
  --header 'X-GatePay-Nonce: <x-gatepay-nonce>' \
  --header 'X-GatePay-On-Behalf-Of: <x-gatepay-on-behalf-of>' \
  --header 'X-GatePay-Signature: <x-gatepay-signature>' \
  --header 'X-GatePay-Timestamp: <x-gatepay-timestamp>' \
  --data '
{
  "merchantTradeNo": "163",
  "env": {
    "terminalType": "APP"
  },
  "currency": "USDT",
  "orderAmount": "118.75",
  "merchantUserId": 123,
  "goods": {
    "goodsType": "02",
    "goodsName": "Sipariş Ödemesi - 177",
    "goodsDetail": "Sipariş No : 160"
  },
  "chain": "MATIC",
  "fullCurrType": "USDT_MATIC"
}
'

{
  "status": "SUCCESS",
  "code": "000000",
  "errorMessage": "",
  "data": {
    "prepayId": "65466648727916544",
    "fiatCurrency": "",
    "fiatAmount": "",
    "currency": "USDT",
    "terminalType": "APP",
    "expireTime": 1677573665219,
    "qrContent": "http://openplatform.gate.io/qr/GA0cskPehKxQpshvm3Goeve8dHpwCl6yCHLSWUYrLqo=",
    "location": "https://www.gate.com/cashier?prepayid=65466648727916544",
    "payCurrency": "USDT",
    "payAmount": "118.75",
    "chain": {
      "chain_type": "BSC",
      "address": "0x86608d3C9f979b98a3b2417216eD859d313E339D",
      "fullCurrType": "USDT_EOS"
    },
    "channelId": "123456",
    "goodsName": "Sipariş Ödemesi - 177",
    "inUsdt": "118.75"
  }
}