Overview

• Brief Description
• Merchant Number
• API Request URL
• Signature Logic
• Request Parameter Acquisition
• Request method

Brief Description

• This section describes the parameters to be obtained before interconnection

Merchant Number

• The merchant number is the parameters obtained after the merchant receives the information that sent to you by text /Telegram/ email after the Paypro workbench staff opens the account

Parameter	Description
Merchant Backstage	https://partner-test.paypro.tech/admin/login
Merchant Number	10-digit merchant number (example: 0000000001)
Merchant Login Account	Usually log in by email account
Merchant Login Password	Change your password immediately after logging in by agreed email account
Merchant Key	Can be obtained by operation in homepage after the merchant logs in the system

API Request URL

• Sandbox URL：https://openapi-test.paypro.tech/pak-pay
• Sandbox merchant number: 4610351925
• Sandbox key: Please contact the business development officer
• Production URL： Please contact the business development officer

The information returned by the interface prioritizes determining whether the first
layer's request is successful, and only after the request is successful, the second
layer's transaction results could be checked

Signature Logic

• 1：The interface must report the sign parameter and the signing logic

Step 1: All requested parameters are judged from a to z according to the first letter of the parameter name, and combined into key1=value1key2=value2......

List<String> keys = Lists.newArrayList(map.keySet());
Collections.sort(keys);
StringBuilder request = new StringBuilder();
for (String key : keys) {
  String value = String.valueOf(map.get(key));
  if (StrUtil.isNotEmpty(value) && !"sign".equals(key)) {
    request.append(key).append("=").append(value);
  }
}
log.error("encrypt string : {}", request);

Step2：Use app secret as salt for md5 encryption.

Parameter	Description
SIGN_TYPE	MD5
CHARSET_NAME	UTF-8
salt	Private Key

try {
 MessageDigest md5 = MessageDigest.getInstance(SIGN_TYPE);
 md5.update((str + salt).getBytes(CHARSET_NAME));
 return byte2hex(md5.digest());
} catch (Exception e) {
 if (log.isDebugEnabled()) {
   log.debug("md5 加密异常", e);
 }
}
return "";

public static String byte2hex(byte\[\] bytes) {  
  StringBuilder sign = new StringBuilder();  
  for (int i = 0; i < bytes.length; i++) {  
    String hex = Integer.toHexString(bytes\[i\] & 0xFF);  
    if (hex.length() == 1) {  
      sign.append("0");  
    }  
    sign.append(hex.toLowerCase());  
  }  
  return sign.toString();  
}

• 2：The requested merchant number is required to be added in the header submission.
• 3：IP whitelists need to be added during the test. For this operation, please contact Paypro business development officer.

Request Parameter Acquisition

public static Long getMilliByTime(LocalDateTime time) {
 return time.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
}

Request method

• All requests are Post requests, and the data format is json