Hello.
This way I found a faulty file.
In the show.php file of line 427, from where it is written <!
Fancy TAB
> to the end, it prompts the product page after clicking the button Redirect purchase to payment page. When I removed this snippet of code, the notification plugin worked well and displayed the Add to Cart prompt.
These tabs display (Product Description), (Custom Fields), (Komento). In the last tab I was going to put the product files. But because of my lack of mastery of php, I failed to execute it.
Okay! I don't know exactly which part of the code caused the problem. That's why I attached this file along with product screenshots. Get help when possible.
Thank you.