Has somebody succeeded integrating Alipay (Chinese payment system, roughly equivalent to Paypal) within his Zencart website?

I have seen some old and unanswered posts on that matter, but no decisive hints.

Furthermore, the Alipay company (part of the Alibaba group) refuses to deliver the documentation related to the API if a contract is not signed with them (I would prefer to check the feasibility of the integration within my website before signing anything).

Any help will be welcome.