Stripe Checkout requires that you know how to write and integrate code. Plasso does not. Of the 2.4 billion people with internet-connected computers, only 1-2 million can write code.
It's not copy and paste. Stripe Checkout does not even take a payment. All it does is present the UI to collect information, then returns a token to your page via a hidden form field. You must then write code to accept the form submission, use Stripe's API to make a charge against the token you received, send receipts and deliver the product.
Stripe Checkout requires that you know how to write and integrate code. Plasso does not. Of the 2.4 billion people with internet-connected computers, only 1-2 million can write code.