AFAIK it is possible now to get the ICP, but to integrate Wechat / Alipay or any other meaningful service you need a Chinese legal entity. A foreign company can register WFOE which is a Wholly Foreign Owned Enterprise, you do not need any Chinese partners or anything, but might be costly to set up and in paid-up capital depending on the industry. E.g. for a fashion brand I know of, they asked to have ¥10 million ($1.5 million) to be deposited within 1 year.