As the name implies, Paperform is a form-building tool. Notably, it lets you accept payments through Stripe, Google Pay, Braintree Payments, PayPal Business Payments, and Square Payments.
API info
You can also use it to build landing pages:
How to Make a Stunning One-Page Website with Paperform
While you can certainly use Paperform for basic e-commerce, it seems much better suited for freelancers or agencies who want to collect customer info to provide quotes or to book services.