wp-ultra-simple-paypal-shopping-cart

They have a good idea here, but there is a LOT of work to do. A. Some of the examples don't work because there are no checks to make sure there is a shipping amount. If not, it crashes. B. If you refresh the page, the default item gets added to the cart again. Those are the two things I noticed before deleting the plugin.

NO SUPPORT after one week of posting in support forum. Seems awol. No website, no means of getting support.

When a customer tries to buy more than one product at a time, they get a Paypal redirection error "Things don’t appear to be working at the moment. Please try again later" The only thing I could find is Paypal has updated its systems on 29th March 2017. Any webform which is used to accept payment via Paypal Standard payment gateway should have "Billing Address" field on it. Make sure you have the field added to the webform and then place it on the checkout page. I don't see a way to add a billing address form in Ultra Simple Cart. Meanwhile, customers cannot check out with more than one product in their cart.

Tried many different cart / commerce plugins and this is the best solution by far. So beautifully simple to learn and use : and it just works! Very flexible and customizable via CSS. Thank you so much for your excellent work.

I sell software. This worked really nice with my customers.

I had a few issues with this plugin, and the developer quickly responded in the support forum with solutions. This is a very nice alternative to PayPal buttons and more complicated systems.