Quote Originally Posted by Shawon Das View Post
my store version is 1.3.9h
This is a very old version of Zen Cart. IMHO, fixing it is counter-productive. It's just going to continue to be to old.
Take a look at https://www.zen-cart.com/entry.php?3...d-of-upgrading and try getting up to the latest version.
You'll have to enter your paypal credentials in the new version but you will be up to date across the board.