Don't just use Stripe
In the beginning, fman used Stripe as its sole payment processor. This made it possible to buy fman by credit card. But people repeatedly wanted to pay with PayPal as well, because they don't want to give their payment details to a random site.
PayPal was integrated into fman's Purchase page last month. Since then, more than half of sales were processed by PayPal – even though it isn't the default option! This means that the blood, sweat and tears that went into setting up PayPal paid off.
If you are selling to consumers, I recommend offering PayPal as a payment option. If you don't want to spend days wrestling with PayPal's horrible APIs, I've heard that Braintree and FastSpring let you accept PayPal as well and are easier to set up. Good luck!