Signature Rules

1. Sort all parameters in ascending order according to the ASCII code of their names (dictionary order)
2. Use & to connect the parameter name and value, such as: param1=value1&m2=value2
3. Add &key=merchant_key at the end
4. Perform MD5 encryption on the concatenated string to obtain a 32-bit lowercase string

Example:

Original parameters:

{
    "tenant_id": "000001",
    "app_key": "0cb3bd11ae",
    "timestamp": "1757491985",
    "tenant_order_no": "test250910001",
    "amount": "35.44",
    "notify_url": "",
    "sign":"3cb2e3c29cd79ed0fa4043c1b2540c28"
}

After sorting, concatenate:

amount=35.44&app_key=0cb3bd11ae&tenant_id=000001&tenant_order_no=test250910001&timestamp=1757491985&secret=ODE5Y2I5OTkwNjMzM2RjZWU1OTAyNzJiOGVjMjQ1MDYwN2QyYmQ5ODZmYzA2YWI1MGM3OTIwMDIyOWIyOWZiNA==

Signature obtained after MD5 encryption:

3cb2e3c29cd79ed0fa4043c1b2540c28