curl --request POST \
  --url https://openplatform.gateapi.io/merchant/open/institution/v1/pay/fixedaddress/save \
  --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 '
{
  "channelId": "smart_shop",
  "chain": "ETH",
  "currencies": "DAI,USDT",
  "callbackUrl": "https://www.abc.com/callback"
}
'

{
  "status": "SUCCESS",
  "code": "000000",
  "errorMessage": "",
  "data": {
    "channelId": "smart_shop",
    "chain": "ETH",
    "address": "0x2EBa11a702F1d53c6e2F08278819e26E6e4a63ae",
    "currencies": [
      "DAI",
      "USDT"
    ],
    "callbackUrl": "https://www.abc.com/callback",
    "desc": "",
    "ChainShowEn": "ETH /ERC20"
  }
}