I happen to use Paddle. Happen because Stripe isn’t available in my country and Lemon Squeezy wasn’t around / was very new back then. It’s OK but it really irks me that they don’t really fight chargebacks. (I haven’t had many but the fee they throw on you automatically is so hefty for a B2C.)
Their V1 API (not Paddle “Billing”) is…not the best I’ve used.