API PAY-IN TRANSACTION

USDT region pay-in API (USDT). See Payment methods.

Request

The Pay-In API enables merchants to initiate payment collection transactions from customers. This API supports various
cryptocurrency payment methods for secure and efficient digital asset collection.

Request Path:

sandbox: https://sandbox-gateway.smilepayz.com/v2.0/transaction/pay-in
production: https://gateway.smilepayz.com/v2.0/transaction/pay-in

Header Parameters

Field	Required	Type	Description
Content-Type	M	String	application/json request body.
X-TIMESTAMP	M	String	Datetime with zone offset, format yyyy-MM-ddTHH:mm:ss±HH:mm
X-SIGNATURE	M	String	Signature of JSON body (see product Signature doc).
X-PARTNER-ID	M	String	Your merchantID

Body Parameters

Field	Required	Type	Description
orderNo	M	String(32)	Merchant-unique id
purpose	M	String(64)	Memo to payer
merchant	M	Object	Wraps merchantId and optional sub-merchant fields.
merchantId	M	String	Smilepayz merchantId for this call.
merchantName	O	String	Merchant display name.
subMerchantId	O	String	Sub-merchant ID.
subMerchantName	O	String	Name for subMerchantId.
money	M	Object	Currency plus amount for this transaction.
currency	M	String	Fixed to USDT.
amount	M	Number	Amount
network	M	String	Blockchain network specification for digital currency Format: Predefined network codes Examples: ERC20, BEP20, TRC20 Indicates the blockchain network for transaction processing
productDetail	O	String(128)	Product or service description Format: UTF-8 encoded string Maximum length: 128 characters Used for transaction identification and reporting
paymentMethod	O	String	See Payment methods doc.
expiryPeriod	O	Number	ExpiryPeriod, default 3600.
redirectUrl	O	String(256)	HTTPS post-pay return URL, max 256 chars.
callbackUrl	O	String(256)	HTTPS async status URL, max 256 chars.

Example Body – Transaction Request:

Content-type: application/json
X-TIMESTAMP: 2020-12-17T10:55:00+07:00
X-SIGNATURE: 7MHd9v5/m9JeqmDZVwWBZUZ5J5...7120QnFEny7Qm7uQR1G0TWCh10fsU6nVxiRoeoQ==
X-PARTNER-ID: 20001

{
  "network": "TRC20",
  "merchant": {
    "merchantId": "20001",
    "merchantName": "Smilepayz Demo Store"
  },
  "payer": {
    "phone": "+66812345678",
    "email": "[email protected]"
  },
  "money": {
    "amount": 100,
    "currency": "USDT"
  },
  "orderNo": "20001usdtwallet98b010db244c99d",
  "paymentMethod": "WALLET",
  "purpose": "Crypto checkout — demo invoice",
  "redirectUrl": "https://docs.smilepayz.com/en/"
}

Response

HTTP Response

Field	Required	Type	Description
Content-Type	M	String	application/json response or callback body.
X-TIMESTAMP	M	String	Datetime with zone offset, format yyyy-MM-ddTHH:mm:ss±HH:mm

Body Parameters

Field	Required	Type	Description
code	M	String	00 success, other values error.
message	M	String	UTF-8 human-readable result line.
orderNo	M	String	Merchant-unique id
tradeNo	O	String	Smilepayz tradeNo for this order.
merchant	M	Object	Wraps merchantId and optional sub-merchant fields.
merchantId	M	String	Smilepayz merchantId for this call.
merchantName	O	String	Merchant display name.
subMerchantId	O	String	Sub-merchant ID.
subMerchantName	O	String	Name for subMerchantId.
money	M	Object	Currency plus amount for this transaction.
currency	M	String	Fixed to USDT.
amount	M	Number	Amount
transactionTime	M	String	Transaction completion timestamp Format: yyyy-MM-ddTHH:mm:ss Example: 2024-12-17T10:55:00 Used for transaction timing and audit
channel	M	Object	Channel payload (paymentUrl, qrString, …).
status	O	String	Order or payment status enum value.

Content-type: application/json
X-TIMESTAMP: 2020-12-17T10:55:00+07:00

{
    "channel": {
        "paymentMethod": "WALLET",
        "paymentUrl": "https://gateway-test.smilepayz.com/cashier/#/loading?tradeNo=3012003025112812141312194",
        "cardData": {
            "payeeBankCard": "TS8taf44vwibX7z4vE7aqrA7xVQjzzGKoZ",
            "payAmount": 100.0,
            "network": "TRC20"
        }
    },
    "merchant": {
        "accountNo": "11120001202406101410",
        "merchantId": "20001",
        "merchantName": "Smilepayz Demo Store"
    },
    "money": {
        "amount": 100,
        "currency": "USDT"
    },
    "orderNo": "20001usdtwallet98b010db244c99d",
    "tradeNo": "3012003025112812141312194",
    "status": "PROCESSING",
    "transactionTime": "2024-11-19T12:51:47+07:00",
    "code": "00",
    "message": "Successful",
    "responseCode": "2009000",
    "responseMessage": "Successful"
}

Notification

HTTP Request

Field	Required	Type	Description
Content-Type	M	String	application/json request body.
X-TIMESTAMP	M	String	Datetime with zone offset, format yyyy-MM-ddTHH:mm:ss±HH:mm
X-SIGNATURE	M	String	Callback body signature (see Callback signature guide).

Body Parameters

Field	Required	Type	Description
orderNo	M	String	Merchant-unique id
tradeNo	M	String	Smilepayz tradeNo for this order.
merchantId	M	String	Smilepayz merchantId for this call.
merchantName	M	String	Optional Merchant display name.
subMerchantId	O	String	Sub-merchant ID.
subMerchantName	O	String	Name for subMerchantId.
paymentMethod	M	String	See Payment methods doc.
transactionTime	M	String	Transaction completion timestamp Format: yyyy-MM-ddTHH:mm:ss Example: 2024-12-17T10:55:00 Used for transaction timing and audit
status	M	String	Order or payment status enum value.
money	M	Object	Currency plus amount for this transaction.
currency	M	String	Fixed to USDT.
amount	M	Number	Amount
payer	M	Object	Payer object per region rules (see Payer model).

Return

Important Response

Notification Response: Please return only the string SUCCESS to acknowledge receipt of the notification

{
  "orderNo": "20001usdtwallet98b010db244c99d",
  "tradeNo": "3012003025112812141312194",
  "merchantId": "20001",
  "merchantName": "Smilepayz Demo Store",
  "subMerchantId": "",
  "subMerchantName": "",
  "paymentMethod": "WALLET",
  "transactionTime": "2024-11-19T12:51:47+07:00",
  "status": "SUCCESS",
  "money": {
    "currency": "USDT",
    "amount": 100
  },
  "payer": {
    "name": "Demo Payer",
    "email": "[email protected]"
  }
}

SUCCESS