Can a department store, K Mart, refuse to accept payment in cash and demand that Sears credit card be used?

My purchase was @29.99, tendered a $20.00 Reward Certificate good at any Sears or K Mart. They accepted the certificate and refused to take cash for the difference, insisted it must be charged to the Sears credit card. I thought Legal Tender must be accepted always. Am I wrong?

How does online credit card payment and the whole online payment system work?

1)How does the whole system and procedure work?
2)Do debit cards work as well as credit cards?
3) I know the consumer has to take precautions but what are the security procedures and precautions taken by credit card companies and online payment companies and systems to protect you?
4) What shud i look for in a website to [...]

Where can I get a virtual master or visa card to pay online?

Some companies, like Yahoo only accept master or visa card payment. I want to use their website builder to create a website, but cant because they need card details. I am now living in Thailand and cant open a bankaccount because of their regulations. Who can give me advice?

How come you have to pay at least $1 for online credit card payments? And why only 1 payment every 24 hours?

Why is it that credit card companies will not accept a payment of less than $1 and you can’t make more than one payment every 24 hours? Is someone out there trying to pay their credit card bill a nickel at a time? And what would happen if they did? Inquiring minds wanna know.
By online [...]

How can I accept credit card payment from someone?

I have some things for sale and the guy wanting to buy them lives 500 miles away and wants to pay by credit card. Is there any way to receive his payment?