1. Communication Protocol

When merchants integrate with HaiPay services and call the API, they must follow the rules below:

Type	Description
Transmission	To ensure transaction security, HTTPS transmission is required
Submission	Requests must be submitted using the POST method
Data Format	Both requests and responses must use application/json format
Character Set	UTF-8 character encoding must be used
Signature Algo	SHA256WithRSA
Signature Req.	Both request and response data must be signed and verified. See Configuration & Signature Rules for details
SSL/TLS Version	TLSv1.2, TLSv1.3

2. API Structure

Below is the structure for calling HaiPay APIs. The API name is appended to the request URL. The content inside data contains the concatenated payload for different business operations.

POST https://uat-interface.haipay.asia/{currency}/{api_endpoint}
{
    "appId": 1054,
    "orderId": "M233323000059",
    ...
    // sign: Signature of the request body using the merchant's privateKey
    "sign": "af0gAHkUOyYHu9owQp8NJ4mPEeUW4vuJcjdxqLIzrVw8AvpLSjD1DXupReSG/CyuSkFRyiIvCp5u703AuGGmfgD2gKDH3Ywau41bAbG2jnHJ8mtjiSJ5iWUzanyd4Kr7d1+rETbzUl7/BkW3t0X8UUFdqpxwG8DPUjAwUKfplWDHV7koG51Ozexd80DCsmW6eWdouAZ1uNXGLYmV3ftE3BmfNRtuv1C5bfTJWrTEIOxbF6g2uYOFZTlIgrQgd7/2PsAYwQQXNz8Q8CYl4OxqCv4pXJxaLWPbR5tqZu9og5kn32C9aHW/NlU1y39vzz+4ef81yPAqUV9oHlSMSPrMmw=="  
}

Request URL:

Environment	URL
Test	https://uat-interface.haipay.asia
Production	To be provided at go-live

3. API List

Product	API Name	Endpoint	Description
Collection	Collection Apply	/collect/apply	User makes a payment to the merchant (Top-up)
	Collection Query	/collect/query
	Refund Apply	/refund/apply
Disbursement	Disbursement Apply	/pay/apply	Merchant makes a payment to the user (Withdrawal)
	Disbursement Query	/pay/query
Account Balance	Account Query	/account/ledger	Merchant queries account balance

For details, see API Documentation.

4. Parameters

Common Request Parameters

Parameter	Required	Type	Description
appId	Yes	Integer	Business ID (retrieved from the backend, must correspond to the currency in the request URL)
sign	Yes	String	Signature (see Configuration & Signature Rules)

Request Example:

{
    "appId": 1000,
    ......
    "sign": "fCywFPOojpRIPi4ph81+CwoAvMXV1va2XR1DQVJeGnZwzNVd0hmvpud7nbP/3lc5JeTVELomruwVTGLtr+BTGT0IweAFTGNvNUuqOs3I4KG5tjvhPM7wm9NtwK2uAX1niLoylt4DcLfy2TeaxPQYDCJJRf7Qm7sDwJX5VoFt8RO9EC2ih+0Ike2+cAyRpIfKENPoIGQbUwvH6KkzHzjljcuvcSqq4D+iZid7up58A866RFrrJH9vkwaF+2mYxa/7awQIwAq8HPOxHkzLfVg74MZC8I1TOKvQAxkAquoNMMyrcAqRIopURfrgEaAtyW/ThPdyduYVlFeMg7BkpGLqZQ=="
}

Common Response Parameters

Parameter	Required	Type	Description
status	Yes	String	1: Normal, 0: Exception
error	Yes	String	Error code
msg	Yes	String	Error description
data	Yes	Object	Business data (included in signature check)

Response Example:

{
    {
        "status": "1",
        "error": "00000000",
        "msg": "",
        "data": {
            ......
            "sign": "PWA7B2u1hGr1VRxOCZbRuXQXtJiA6BgPExFnFv73hKJ+zcZfOe/R+y+inlwWcdDBzfix35+dl6raEs/yG/hcYyQOwDQ+mVjIt5wFk6iX7GPw557138yBdAmuMqvWM2IF+omLFcQFJvzfbR84rCyOmebDJlhkYMga5TTFHVLicUx3bPIrOJLoWJHrnZfcVFAJ+P5mUQhMH/cf+YmYZvrqq34pMJh6PcP5vyruJ8aNV0QfyHR42AHLIgp+HnOcZpA0aUzFXM5zpsgXK3QR/KO3vLiKd77UaZNO6g5TN/Ck2MtLkBVxyvIHstgXFXKF1e+uc91FdBHK5nfmrjLQ2wyeUA=="
        }
    }
}

Error Codes

Error Code	English Response	Description
1001	param is null	Parameter is null
1002	Illegal Param	Illegal parameter
1003	system exception	System exception (order may already be recorded, awaiting async notification or query for final status)
1004	system is busy	System busy (order may already be recorded, awaiting async notification or query for final status)
4005	order already exit	Order already exists
4011	appId do not exit	appId does not exist
4012	you do not have an available product, please connect admin	Merchant product unavailable, contact administrator
4013	order not exit	Order does not exist
4014	order is already end status	Order is already in a final status
4015	this merchant do not have a collect bank	No available collection account
4016	your account do not have enough money	Insufficient account balance
4031	ip adress is Forbidden	Illegal IP
5012	pay in channel not functional, please connect customer service	System exception