Sell digital goods online

Avoid Paddle.com by any means.

Lemon Squeezy, 2checkout, and Stripe look great.

Stripe has little interest in accounts that do not generate big revenue for them and seem to have a heavy overhead. It does not seem to be a merchant of record, so they do not handle tax for you. It is impractical to use Stripe unless you can comfortably handle tax.

2checkout has absurd requirements for all kinds of business documents. 

Payoneer probably does not have