shopping - paying for something

How would you like to pay for this?
I'm sorry?
Will it be cash or charge?
Charge. Do you accept American Express?
We only accept Visas or MasterCards.
I see.
I'll ring you up. (calculate the price)
If you sign up for our store card, you can pay off the bill in six months, interest-free.
Why don't you tell me earlier?
Sign me up right now!