Shopping cart does not match payment gateway

Hello,

We have an issue where the shopping cart adds up everything correctly, but then when you go to checkout, it doesn't add tax or the shipping charges. How do we fix this?

We are running litecart 2.5.5, with Square app and shopxc theme.

Thanks,
Dan

This is related to the specific payment module you are using.
You will need to add it to the code.

https://www.litecart.net/en/wiki/how_to_create_a_payment_module

Now I just wish I knew which code and which files to edit. I did send the module creator a note.

I understand. The author put the code out for free without any obligations to provide support.
What I can recommend is teaming up or hiring the author and work out these details together.
Making good progress is a great deal of fun.