[SOLVED] No completed orders, yet payments going through

[MrBaseball34]

Just wondering what could cause a customer to not be able to complete an order.

The payment goes through but his cart is not cleared and we don't get a notification
AND an order is never created in the DB.

We are at a loss as to why this is happening.

We are not in sandbox mode as far as I can tell. (how could I know for sure?)

[MrBaseball34]

OK, PayPal is setup correctly,directory permissions for the /modules/paypal directory are like this:
PS v1.3.0.1 /modules/paypal directory (w/permissions)

-rwxr-xr-x  confirmation.tpl
-rw-r--r--  en.php
-rw-r--r--  es.php
-rw-r--r--  fr.php
-rw-r--r--  logo.gif
-rw-r--r--  paypal.gif
-rw-r--r--  paypal.php
-rwxr-xr-x  paypal.tpl
-rw-r--r--  prestashop_paypal.png
-rw-r--r--  redirect.php
-rw-r--r--  redirect.tpl
-rw-r--r--  validation.php

But when I try to navigate to /modules/paypal/validation.php I'm getting a "500 Internal Server Error"

Both my stores are on the same server so the configuration (curl, openssl) is exactly the same for both.
I still cannot figure this one out.

I continue to get a "500 Internal Server error" with one site even though permissions on both stores and
configurations are exactly the same.

Can there be anything I'm missing in the Prestashop configuration?

The store we are not having problems with is a PS v1.2.5 and the store we can't get completed orders is
PS v1.3.0.1 so the /modules/paypal directory contents are a little different.

PS v1.25 /modules/paypal directory(w/permissions)

-rwxr-xr-x  confirmation.tpl
-rw-r--r--  en.php
-rw-r--r--  fr.php
-rw-r--r--  logo.gif
-rw-r--r--  paypal.gif
-rw-r--r--  paypal.php
-rwxr-xr-x  paypal.tpl
-rw-r--r--  prestashop_paypal.png
-rw-r--r--  validation.php

What the heck is wrong?????

[MrBaseball34]

Lo and behold...
If you do not get ALL the permissions correctly, you WILL get the dreaded "500 Internal Server Error"
and PayPal will not be able to send notifications back to your store!!!!

My /modules directory had somehow gotten a 777. That is what was causing the 500. Now I just hope that is the cure for all my
ills in regards to PayPal payment notifications.