$ms = md5($transactionid.':'.$secretkey);
You need to concatenate with .
Question
How can I divide a md5 function with a colon?
Currently I have this:
$ms = md5($transactionid:$secretkey);
But that code is invalid.
I can divide it with a "." but not a ":"?
Solution
$ms = md5($transactionid.':'.$secretkey);
You need to concatenate with .