GRAMMAR GRAMMAR The verb pay is followed directly by a noun when you are talking about paying a person• I'll pay you tomorrow. • I haven't paid my accountant yet.Payis also followed directly by a noun when you are talking about the amount of money you pay• I've already paid £700. !! Do not use pay followed directly by a noun referring to the thing you are buying. Use pay (an amount of money) for something• When I paid for my tickets (NOT paid my tickets) the man told me there was no discount.• I paid £100 for this jacket.When you are talking about whether you pay for something using a cheque, a credit card etc, use pay by• If you pay by credit card, you get free insurance.When you are talking about the type of money you use to pay something, use pay in• You can only pay in euros.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.