China is a country with foreign exchange control. If you want to change RMB into Hong Kong dollars or US dollars and remit it to the account of a Hong Kong company, if you buy goods from a Hong Kong company, the bank will automatically change it into RMB for you and remit it. If it is a service provided by a Hong Kong company for a domestic company. Then domestic companies will also sign contracts to transfer fees after paying taxes in China. If you want to pass Alipay, as far as I know, it seems that you can't do it for the time being.