The issue is that this module hasn't been upgraded to the latest version of Zen Cart.
Therefore two changes are needed to the out of the box version:
1) adjust any and all files that start with <? to be <?php
2) 'Register' the admin page. Here are instructions:https://www.zen-cart.com/content.php...e-v1-5-0-admin
For the parameters mentioned in that link use these:
Page Key: Store Credit (if you get an error use StoreCredit)
Page Name: BOX_CUSTOMERS_CREDIT
Page Filename: FILENAME_STORE_CREDIT
Menu: Choose where you want it to appear
Sort Order: 20
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