Files drive.google.com/file/d/1eGgj59ZZx5GLFJI.../view?usp=drive_link

Hello and thank you for your order.
I sent your decrypted files to your e-mail box.
Good reception.

The DeZender Team

There is a way to correct these small mistakes in quotation marks and line breaks that are wrong, but correcting them by hand takes time. Thanks. Everything decoded as promised
Example:

$sql_cart = 'SELECT c.*,' . "\r\n\t\t\t" . 'p.name AS product,' . "\r\n\t\t\t" . 'p.price,' . "\r\n\t\t\t" . 'p.image_path' . "\r\n\t\t\t" . 'FROM `cart_list` c' . "\r\n\t\t\t" . 'INNER JOIN product_list p ON c.product_id = p.id' . "\r\n\t\t\t" . 'WHERE customer_id = \'' . $customer_id . '\'';

They are not incorrect, but converted from the decompiler which detects line breaks and tabs and converts them.
You can make patterns under, for example, Notepad++ to convert all of this, but I see for example "\r\n" which are Windows line breaks, but the PHP file decompiles into Unix format or into "\n".