What is debugging / developer mode at shop addons for?
The debug mode is used to show the content of errors in your store.
For example, if there is a problem with card payment in the store or error 500 (white page), this mode allows you to view information about the situation to help you pinpoint the problem.
Tpay.com payment plugins have a built-in system for logging out errors, however, information shown in this mode may be equally useful when creating a technical application.
Due to the possibility of disclosing additional information that is not normally available to store customers, this mode should be turned off in a store available to the public.