Payment module and link with the bank

Hi

I'm completely new to e-commerce and don't quite undrestand the notions of "payment module" or "payment provider".

I work with a belgian bank,l called KBC,  they propose an online payment solution that doesn't sound the implementation of an extra module:

"...
The KBC Payment Button is a digital button on the payment page of your web shop. Your customers can pay for their purchase with just a few clicks or taps, on their smartphone or tablet or using the card and card reader.
..."

Could someone explain me how do I link the webshop to my bank?
If an extra module is necessary, what choice would be best for KBC. I also have customers who might want to pay with WePay or AliPay, how to include those payment options?

Thx

This is probably the old "cart" method from the 90s as seen by Paypal. Where you create a form submit button or link that holds an amount to pay and who is to receive it.

For that you would need to create a payment module and pay extra attention to GET, or POST method returned by transfer().

You also need the bank to redirect the user to a return link. Use the verify() method to verify the payment.

https://wiki.litecart.net/how_to_create_a_payment_module

Thanks a lot Tim.
I should have mentioned that I am no developpee, just an end-user.
If I understand well, banks provide modules from their side that don't use standard technologies and a module for Litecart need to be created for each type of bank module ?

It's not uncommon that the payment providers themselves create those modules. They want market, so they try to go where there are the most customers.
Every integration for every e-commerce platform is specific for that specific provider and that specific e-commerce platform. There is no universal fitting.
See if a freelancer can help you out with a time budget of 10 h maybe.