In order to create a Signature the following algorithm need to be followed , Briefly explained with an example :

URL seed comprises of CODE + Cust ID + Devive Number
Partner Key and Secret key
System Time will be unix epoch time in milliseconds

Thus Seed will be unix epoch time in milliseconds for version 1

The required Signature is Concatenated to form a MD5(Seed)

For e.g.

Urlseed :- code | custId | deviceNum
Partnerkey :- partnerkey
Secretkey :- secretkey
Time :- unix epoch time in milliseconds

For Version = 1
Seed : Urlseed + Partnerkey + Secretkey + Time
Signature : MD5(Seed)