If you spend money, the money will be directly transferred from your card to his company account, and the money cannot be returned.
So the hotel deposit is pre-authorized.
Pre-authorization means freezing. For example, if you swipe 1000 in advance, your card will be frozen 1000, and the hotel has the right to transfer this 1000 to their account at any time (and it can exceed 10%). Of course, you don't have to worry about drawing too much. Banks have sound laws in this regard.
When checking out, if 1000 yuan is cancelled, that is, thawed, then the money will be thawed according to the situation (referring to the length of time).
For example, local credit cards are thawed almost the same day; If it is outside the province, it basically takes 3-5 working days to thaw; If it is transnational, it basically takes one month (even if it is UnionPay).
In Hong Kong, it is estimated that it will take several weeks. If you are not at ease, you can call the hotel directly and ask how long it will take for the pre-authorization of the mainland card to be returned. They should be exposed to this kind of business often and will tell you directly.