I have that option checked in general settings but I don't see the logs. I don't have a /store/ folder in the extension folder at all.. :\
I actually just noticed another topic in your forum support called "Error?" written here by somebody who said that they get the payment when donating by hitting the credit card option instead of paypal option. So I tested it.. and it seems to work when hitting the credit card option. Let me show you a screenshot of what I mean, I don't mean to hijack THEIR thread, but it really is an option using ur donation extension look at this screenshot ---->
https://i.imgsafe.org/7ec30bd5f6.png
It seems like EVERY option such as.. Auto grouping... and adding to donor list and adding to the donation bar works fine when somebody donates by hitting "Pay with card" but once you do it through the paypal option it doesnt auto group.. doesnt add to donor list and it doesnt change the bar at all ( I had friends with verified paypal accounts and everything help me try just incase the accounts were the reasons..)
Here is some information about your extension to verify I'm running YOURS
PayPal Donation
Clean Name:
skouat/ppde
Description:
An extension which allows you to add a PayPal donation page on your phpBB board
Version:
1.0.2
Homepage:
http://skouat.github.io/ext_paypal_donation
Licence:
GPL-2.0
And current version says up to date.