I need to compare the biggest Chinese internet payment providers (we call them BAT - Baidu, Alibaba, Tecent) with their American counterparts (Google, Apple, Facebook, Amazon). Every suggestion will be helpful where can I find information describing on a regular basis market share in third-party payments, e-commerce of both groups. Some financial data ralated to both groups will be also very helpful. I need to compare both groups in as many aspects as possible.