I would recommend Stripe.
They are easy to integrate and offer client libraries in multiple languages. When considering support to developers, they have an IRC channel where technical questions and query posted. You can also contact them by email or phone call. Stripe provides U.S tax reporting facility to automate ‘Form 1099-K’. Also, it is supported in most parts around the world.
But to design the best payment solution, one should consider various factors such as splitting payments between the provider and the customer, offering multiple payment methods, pricing, delayed payouts. Get to know how each factor is important in designing the payment solutions here.
The sharing economy is growing at a rapid pace and shakes things up in almost all industries. Compamies involved in this economy need fast, responsive, intuitive, flexible and evolving business systems in order to stay in the race.