What is the ruling on e-marketing with credit cards where goods are received after payment, and what is the ruling on purchasing gold or manufactured precious metals by special order online where payment is made first and goods are received after a period?

It is not permissible to buy gold and silver online using a Visa card, because they are not delivered to the buyer until after a period of time. It is a condition for their sale with the currencies dealt with today that possession be taken hand-to-hand at the contracting session.