Payin API

▶️ Create Payment Order

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Endpoint: POST /api/pay/neworder

Request Parameters

Parameter Name	Type	Required	Example	Description
mchId	string	✅	INtest067	Merchant ID / Note: The merchant number is not the merchant ID
mchOrderNo	string	✅	202503110001	Merchant Order ID
amount	int	✅	10000	The amount (in cents) must be a positive integer multiple of 100 / Amount, the actual amount is 100, but here you need to pass in 10000
currency	string	✅	INR	Currency, default is INR
phoneNumber	String(30)	❌	6888889999	Phone number, must start with [6-9] and be 10 digits long
payerEmail	String	❌	123@gmail.com	Standard email format must include @ and . where @ must be at least 2 characters long
accountName	string	❌		Username, 2-48 characters long
notifyUrl	string	✅	https://merchant.com/notify	Callback URL
sign	string	✅	5E0AA05D…	Signature Value
remark	string	❌		Remark
returnUrl	string	❌	https://merchant.com/return	Front-end Redirect URL

Request Example

POST /api/pay/neworder
mchId="The merchant ID provided by the operation"
mchOrderNo="202503110001"
amount=10000
currency="INR"
phoneNumber="6888889999"
payerEmail="123@test.com"
accountName="12312312"
remark="123123"
notifyUrl="http://localhost:8081/api/pay/notifyUrl"
returnUrl="http://www.baidu.com/return.htm"
sign="79B1E1C4F3290FBB6CB2FA2CAE2BA67C"

Response Example

{
  "retCode": "SUCCESS",        // Return Code
  "retMsg": "OK",              // Return Message
  "payOrderId": "Le20250311182001",
  "payParams": {
    "payMethod": "urlJump",    // Payment Method
    "payUrl": "https://checkout.lemonpayment.com/#/checkout/100010/checkoutorderId=Le20250311182001", // Payment URL
    "qrString": "00020101021226820014br.gov.bcb.pix2560qrcode.pagsm.com.br/pix/24998ae7-43f8-4dc4-9b07-c53cf2c61deb5204000053039865802BR5907EASYPAY6008SaoPaulo62070503***63047216", // QR Code String
    "url": null,               // Deep Link (qrString or url must be provided)
    "upi": "test123@test123"  // UPI
  },
  "sign": "ABCD1234..."         // Signature Value
}

⚠️ SUCCESS It indicates that the order has been successfully created, but not successfully paid.

▶️Query Payment Order

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Endpoint: POST /api/pay/orderquery

Parameter Name	Type	Required	Example	Description
mchId	string	✅	LEtest067	Merchant ID / Note: The merchant number is not the merchant ID
payOrderId	String(30)	✅	Le20250311182001	Payment Order ID, either payOrderId or mchOrderNo is required
mchOrderNo	String(30)	✅	202503110001	Merchant Order ID, either payOrderId or mchOrderNo is required
executeNotify	Boolean	✅	true	Whether to execute the callback, if true, the payment center will initiate a callback to the merchant again, if false, it will not initiate
sign	String(32)	✅	C380BEC2BFD727A4B6845133519F3AD6	Signature Value, please refer to the Signature Algorithm

Request Example

POST /api/pay/orderquery
mchId="LEtest067"
payOrderId="Le20250311182001"
mchOrderNo="20160427210604000490"
executeNotify=true
sign="C380BEC2BFD727A4B6845133519F3AD6"

返回示例

{
  "retCode": "SUCCESS",          // Return Code
  "retMsg": "Return message",    // Return Message
  "status": 2,                  // Payment Status
  "productId": "8001",           // Product ID
  "amount": 10000,               // Amount (in cents)
  "channelPayNo": "testutr13",   // UTR
  "currency": "INR",             // Currency
  "mchOrderNo": "20160427210604000490", // Merchant Order ID
  "payOrderId": "Le20250311182001",     // Payment Order ID
  "errorMessage": "error message",      // Error Message (returned when failed)
  "paySuccTime": 1730111845123    // Payment Success Time (Unix timestamp in milliseconds)
}

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Payment Status Explanation: -1 Creation Failed ｜ 0 Order Generated ｜ 1 Payment In Progress ｜ 2 Success ｜ 3 Failed

▶️ Payment Callback

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The LemonPay system will POST the collection result to the merchant notifyUrl. Content-Type: application/x-www-form-urlencoded;charset=GBK:

notify?payOrderId=test1997967825452457986&paySuccTime=1768445162000&amount=20000&mchId=ydsh1073&mchOrderNo=Test17651876220001&channelPayNo=12300000000&sign=31415C93341312BE0B8724C7B7D465A2&backType=2&channelCode=10024&status=2&errorMessage=Rejected after secondary review

Upon receipt, the merchant needs to verify the signature and return "success".

If the merchant does not return a response or the signature is incorrect, the system will retry the callback (with intervals of 60/120/180/240/300 seconds).

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Parameter Description

Parameter Name	Type	Description / Description
payOrderId	string	Payment Order ID
paySuccTime	string	Payment Success Time
amount	string	Amount
mchId	string	Merchant ID
mchOrderNo	string	Merchant Order ID
channelPayNo	string	Channel Payment Number (UTR for India)
backType	string	Notification Type
channelCode	string	Channel Code
status	string	Order Status
errorMessage	string	Error Message: Returned when the order status is 3 (Failed)
sign	string	Signature Value