7.3.1 Create a scan-code payment order with a limited amount of digital currency

#Brief description: Digital currency recharge business interface, users can recharge USDT (Tether) to their digital wallet account (market exchange rate) by scanning the QR code

• Request method: POST
• Request interface: https://gateway-domain/wallet-trade-merchant/v1/receive/blockchain/fixed/create
• Request media type (JSON data format)Content-Type: application/json

Request parameters

Parameter name	Type	Required	Parameter meaning	Parameter description
key	string	Yes	Merchant key	apiKey
localOrderId	string	Yes	Merchant platform local order number	Merchant platform generates unique order number locally
localUserId	string	No	Merchant platform local user ID	Merchant platform local user ID
notifyUrl	string	No	Callback address	After the order is placed successfully, the merchant's address will be notified by API callback (for callback details, please refer to Document 3)
successRedirectUrl	string	No	Jump address	Automatically jump to address after success
currency	string	Yes	Currency	Pricing currency (wallet currency)
userCurrency	string	Yes	Currency	The currency that the user needs to pay (the wallet supports digital currencies)
amount	number	Yes	Amount	Order pricing amount
isBlockchain	boolean	No	Whether to return blockchain information (default false)	When true, the callback request will carry the transaction information on the order chain
networkLimits	array	No	Mainnet	Designated payment mainnet, such as TRON, BSC, POLYGON, ETHEREUM
expireSecond	Long	No	Expiration timestamp (seconds)
sign	string	Yes	Signature	See Signature Algorithm for details

Request json sample

{
  "key": "dNNTJZpgFVWlYrVv",
  "localOrderId": "CONAN-TES1225662",
  "userCurrency": "USDT",
  "currency": "CNY",
  "amount": 10,
  "networkLimits": ["TRON", "BSC"],
  "sign": "8b949190830deb3acf5fd356f2424c72"
}

Response json example

{
  "code": 0,
  "success": true,
  "message": null,
  "data": {
    "orderId": 474103463461061,
    "localUserId": null,
    "localOrderId": "CONAN-TES1225662",
    "orderType": "PAYMENT",
    "orderBizType": "PAYMENT_FIXED_DIGITAL_SCAN",
    "paymentUrl": "https://dxpay.dxstudio.org/fixed-amount-pay/S8hQJJWtWW2GZqLXZc9Nm8Xf32tVDoL44jYqJ59mcrMLy1Zr3RKAu4NVmLzg",
    "publicKey": "S8hQJJWtWW2GZqLXZc9Nm8Xf32tVDoL44jYqJ59mcrMLy1Zr3RKAu4NVmLzg",
    "currency": "CNY",
    "userCurrency": "USDT",
    "amount": "10",
    "userReceivableAmount": "1.49",
    "rate": "6.69220484",
    "rateExpression": "1USDT≈6.6922CNY"
  }
}

The returned paymentUrl pops up the payment page, as shown below:


Response data parameter description

Parameter name	Type	Parameter meaning	Parameter description
orderId	string	Order ID
localUserId	string	Merchant local user ID
localOrderId	string	Merchant local order number
orderType	enum	Order Type	PAYMENT:支付订单 | WITHDRAW:提款订单
orderBizType	enum	Order business type	orderBizType type description is as follows
paymentUrl	string	Payment address
publicKey	string	Key	Public Access Key
currency	string	Order currency
userCurrency	string	User payment currency
amount	string	Order amount
userReceivableAmount	string	Amount payable by the user
rate	string	Exchange rate
rateExpression	string	Order exchange rate expression

orderBizType type description:

1. PAYMENT_WALLET_SCAN MINPAY wallet scan code payment
2. PAYMENT_TRANSFER digital currency binding address direct deposit
3. PAYMENT_ANY_DIGITAL_SCAN Scan the QR code to pay any amount of digital currency
4. WITHDRAW_WALLET withdraw money to MINPAY wallet
5. WITHDRAW_ANY_DIGITAL_WALLET Withdraw digital currency to any wallet
6. PAYMENT_FIXED_DIGITAL_SCAN digital currency limited amount scan code payment
7. BATCH_PAY batch payment

Callback returns json data

By default, all callback parameters participate in signature verification. For details of callback parameters, please see callback ]

Callback data

{
  "amount": 11,
  "bizType": "PAYMENT_FIXED_DIGITAL_SCAN",
  "blockchain": {
    "network": "TRON",
    "receiverAddress": "TA1jptT16DssYWVGdVyFWxonku6hWK7En3",
    "senderAddress": "TPutFhYUQnrRxHSmKVwjp55vgk9QY6r5nS",
    "txId": "24d0d0e5d417bd2195c45d64724760ae47fc3b359ee31c5fedf25b40f3584b36"
  },
  "currency": "CNY",
  "key": "h3cS7dBltRU4W1wD",
  "localOrderId": "2820",
  "merchantActualAmount": 8.86,
  "merchantCurrency": "CNY",
  "merchantId": 303122065665,
  "merchantPaidAmount": 10.98,
  "merchantUserId": "97",
  "notifyTime": 1731572168370,
  "orderCreateTime": 1731572133082,
  "orderId": "273124814912907",
  "sign": "699806308a9e055114c378671b0d2a15",
  "status": "SUCCESS",
  "type": "PAYMENT",
  "userAmount": 1.55,
  "userCurrency": "USDT",
  "userReceivableAmount": 1.55
}

When you receive the callback notification, please directly return the string success after the processing is completed, indicating that the message has been successfully received and processed. After the system receives the success response, it will no longer send the callback repeatedly. If the expected response is not received (success is not returned or an exception is returned), the system will resend the callback notification according to the stepped retry mechanism, retrying up to 14 times. The current retry intervals are: 15s, 15s, 30s,180s, 600s, 1200s, 1800s, 1800s, 1800s,3600s,10800s,10800s,21600s, 21600s