Why credit cards are sold through banks and not from Visa or MasterCard directly
Visa and Mastercard are not consumer-oriented companies. They do not consider individual consumers as their direct clients, and do not sell directly to them. Instead, their clients are financial institutions who participate in their networks (which is what they're selling). The institutions target the individual consumers (merchants and credit card holders). American Express, for example, has a different business model. AX doesn't only sell network services to financial institutions, but also services to individual consumers. You can get a AX credit card/merchant account directly with AX, or through their client bank.
I think you'll find that a credit card does have an account number and sort code, I have had a Visa card previously and currently have a Mastercard. Both were paid by Direct Debit, and I could then transfer money to the account when I wanted to pay more than the minimum payment off. Check the introductory letter from the card provider, it should be on there, failing that, contact the provider and ask them for the details, how to pay, or a direct debit mandate for either the whole amount or the minimum amount. "Circa 2002-2005, I was able to successfully ""transfer"" a balance from a debit card linked to a bank account to a Bank of America Visa credit card. As an example, I could say do a balance transfer from the card XXXX-XXXX-XXXX-XXXX (which was a valid debit card number) to the credit card, and the funds would appear in the checking account within a few days, and also the balance on the credit card would go up the amount plus any balance transfer fee. I think they've sealed off that loophole years ago." "First and foremost - make sure where you are purchasing the product is a reputable organization.  Secondly (coming from a biased computer geek) - be aware that Apple is a content trap.  Now on to my answer to your question... How do ""Preferred Account"" programs work? They're ""Preferred"" because they tend to bring in more money to the lender.  It may say No payments for 6 months but the fine print may have you being charged interest during those 6 months, meaning your new shiny computer will be costing more than the sticker price.  The good side is that you don't have to send in any actual payments for 6 months, but be aware that you'll probably be paying more than advertised. What are the different ways I can do it? Your listed options 1 & 2 are both good ways to pay for your new computer.  Yes, option 1 will charge you sales tax, but are you sure paying online excludes sales tax?  Some states mandate it.   Option 2 is a viable option too - probably your best option. 1st - there is possibly no sales tax with purchases made online, although there may be a delivery charge.   2nd - you're not committing to an additional monthly bill, you are essentially paying with cash, just directly from your bank account.  No interest charge! 3rd - that little Visa logo is your friend.  Purchases made through Visa & MasterCard (whether it's a credit or debit card)  normally have an auto-extended warranty feature (you may want to verify with Visa before taking my word on it).  Typically they double any manufacture's warranty.   Lastly - you can always set up a PayPal account and link it to your bank account.  Assuming the site you plan on purchasing the computer from accepts PayPal." In Canada, there are many stores that take debit (Interac) but don't take Visa or MasterCard. For example, a corner store. In the US the reverse is often true: every tiny place seems to take Visa or MasterCard, but not debit. A Visa debit card looks like a Visa card to the merchant. It therefore has the benefit of being usable at places that only take Visa. (Substitute MasterCard as necessary.) This benefit is very small in Canada, less so elsewhere. Meanwhile the money is actually coming out of your bank account just like a debit card, which therefore has the benefit that you're not borrowing money, can't accidentally overspend, and run no risk of incurring interest charges. It is also a way to get what appears to be a credit card when you can't qualify for credit. If you do the majority of your spending in Canada, you don't need a Visa or MasterCard debit card. Your regular debit card (Interac) will work fine for you. If you have a credit card anyway (from another bank or whatever) then again, you don't need a debit card that can pretend to be a credit card. "Your credit card limit is nothing more than a simple number.  When you purchase something, the merchant receives a number (i.e. the amount of the transaction) from your card company (e.g. Visa) in their bank account, and that number is subtracted from your limit (added to your balance). The amount is recorded, and isn't changed, so that's how they get the ""exact"" amount you paid.  Transferring a number is easier than the retailer having to wait for cash to get from you to your card company to them.  Moving numbers around is the basis of the modern financial system. And yes, it is always a risk to let someone else have your credit card number.  An untrustworthy company/person may use it to charge you without your permission, or if they have your full details they could use it as if they were you.  With a reputable retailer like Amazon, the main risk is data theft: If a security hole is found in Amazon's system, someone could steal your credit card info and misuse it." Most 0% interest loans have quite high interest rates that are deferred. If you are late on a payment you are hit with all the deferred interest. They're banking on a percentage of customers missing a payment.  Also, this is popular in furniture/car sales because it's a way to get people to buy who otherwise wouldn't, they made money on the item sale, so the loan doesn't have to earn them money (even though some will). Traditional banks/lenders do make money from interest and rely on that, they would have to rely on fees if interest were not permitted. For me, it is mostly for the fraud protection. If I have a debit card and someone makes a fraudulent charge the money is removed from my bank account.  From my understanding, I can then file a fraud complaint with the bank to recover my money.  However, for some period of time, the money is missing from my bank account.  I've heard conflicting stories of money being returned quickly while the complaint is undergoing investigation as well as money being tied up for several days/weeks.  It may depend on the bank. With a credit card, it is the banks money that is tied up. "When using a debit card in a ""credit"" way, you don't need to enter your PIN, which protects you from skimmers and similar nastiness. Also, assuming it's a Visa or Mastercard debit card, you now have access to all of the fraud protection and other things that you would get with a credit card. The downside for the merchant is that credit card transaction fees are typically higher than debit card transaction fees. I'm less familiar with using a credit card in a ""debit"" way, so don't have anything to offer on that part of your question."