Earlier quoted context omitted.
We tried to use Paddle for our company but back when we were trialling them they didn't even have a dev environment (their suggestion was to create free products in production mode and use those to test dev/staging). At that point I nope'd out of there and moved to Stripe.
Looks like they do now have a separate sandbox system similar to other payment services. 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 eve…
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.