There is some serious Ethics problem here. in Most countries, Hong Kong included, it is illegal to charge a Job seeker or candidate for recruitment services, this is the explicit responsibility of the Employer who is paying for the salary and service in finding people, someone looking for a job is of course in need of earning money, and needs to make their money last till they get the next paying position. When I see the free time, but needs a credit card, I will stop right their. why can I not have the free time without giving my credit card? this is just a trick. 1 good thing is you can get the credit card to refund and then they will chase or refuse to pass on the fee to the company.
I think this comes down to the Singapore Way of doing things,Ethics is not a consider factor in Singapore culture.