I'd like to pay (in) cash.
I'll put it on my credit card.
Can I charge it?
Could you put that on my bill?
Could I put that on my account?
Could you send me an invoice?
Could you bill me (for that)?
Can I put it on lay-away?
May I . . .
pay in cash
pay by check
pay by credit card
pay with a credit card
pay in installments
pay in one lump sum
Could you deliver it to my office?
Do you charge for shipping?
Do I need to pay for postage and handling?
How long will it take?