https://developer.paddle.com/getting-started/c052e9e8d265f-w...
But elsewhere they also still seem to recommend doing things involving your production site for testing purposes. That seems like it's probably a bad idea that could be risky if anything goes wrong and possibly mess up things like reporting and compliance even if everything "works".
There's another interesting competitor that uses Stripe: https://getrevin.com. Their pricing is cheaper than Paddle, making them the cheapest I've seen so far. Not sure if they're any good, though.
I want to get some idea of how much it's going to cost but they dance around the issue completely.
All they do is recommend jumping on a call, which judging by the language on their site, will sound alot like talking to a stereotypical used car salesman.
At that point I nope'd out of there and moved to Stripe.