I had the same idea. I figured that VoIP made it cheap enough for a computer to call me whenever someone tried to charge my card, and I would have to enter a PIN on the phone before it authorized it.

If the timeout on POS card terminals is long enough (about 30-60 seconds), it's enough time for a computer to call my cell, read me the amount to be charged, then wait for me to enter a PIN (not necessarily the same PIN you use on an ATM).

A bank could offer a web interface for me to authorize a list of "always allow" merchants and their charge limits so I don't have to re-authorize supermarkets and recurring subscriptions.

And finally, an interface to list "always deny" merchants.

I like the idea of cancelling an unwanted service by shutting off the flow of money, and then calling their customer support to notify them.

In fact, I think that should be a basic human right. I shouldn't have to argue with a Customer Retention Department (something that pisses me off just in the concept alone), I should just inform them (or let my bank inform them), that I'm no longer their customer.

Me: "Hi, I've cancelled my account."

Them: "I'm sorry, I'll have to transfer you to a customer retention representative."

Me: "No, you don't understand. I've already shut off payments, I'm just giving you a courtesy call. Bye."

I've done that last thing in the UK, however I had to do it via the fraud dept. I had to report unwanted chargers from an e-tailer I'd "cancelled" my account online with as fraud.

However Barclays did make it a reasonably painless and speedy task (comparatively).

On the other hand, consumers have superpowers for chargebacks. If you call up your credit card company and complain you didn't receive a product or you got charged for something that you didn't order you get a refund at the merchants expense.

I have heard cases of merchants that delivered products personally & received signatures getting chargebacks. If the transaction happened over the internet then police, CC companies & banks guaranteed to side with the customer.

It is at the point where it just stops a lot of commerce dead. For many companies fraud is far more expensive then credit card charges. Ironically, this is more the case in commodity industries where margins are pretty low anyway.

Just try ordering some easily resalable product (EG a phone) from an overseas merchant. I know one merchant who throws away any order that come in over the net & retakes the order over the phone because (a) it throws off a lot of the fraudsters & (b) phone-credit fraud goes to a less crowded desk then internet-credit fraud. He is willing to work hard & throw away 1/4 of probably legitimate orders to verify authorisation. There is no way for them to accept money in a way that is guaranteed to stay in their account.

Fraudulent merchants may have a lot of power in this situation but honest merchants are screwed.

If your bank 2.0 was real, you would have the support of most small-medium online stores of you had a logical trade-off in place: Consumers must verify payment / Payments are verified, they can't claim this transaction is "unauthorised".

There are already a couple of ways to help prevent charge abuse by merchants.

Several card issuers already support either single-use numbers, where you get a number issued that works exactly one time for a maximum amount you specify, or enhanced authorization, where you have to verify through the issuers website every time an online charge is processed.

Oddly, almost no-one I've talked to is aware of the programs that already exist (and often for free) to help with fraud.

There have been many proposals to do something like that. There is a proven way to use something called digital cash using public key encryption.

Digital cash allows you to send a long number which represents a single payment and can only be used for that single payment. Thus if the number represents you paying $100 to priceline.com, it can only be used for a single transfer of 100. If someone else tries the same number again, the bank will say, sorry this one has already been used up. In addition to being secure this system can provide absolute privacy.

So theoretically, it is possible but it has not happened. I think one reason is that credit card companies like having people's personal information and being able to see all their purchases.

Digital cash requires no intermediary like a bank. Also, it's still an active research area and not totally solved.

I've thought the same thing. Why isn't there a system that requires a small inconvenience or effort before a particular transaction goes through? Example: I go to buy something online, but before the money really goes from me to the merchant, I have to phone in, identify/authenticate myself, and identify some transaction details (perhaps an ID, the dollar amount, the merchant's name).

I'd be happy to go through a few minutes of inconvenience for a large purchase if it meant significantly greater security for my credit card.

Because both credit card companies and merchants want buying to be as easy as possible without any steps that may give you second thought. Credit cards are all about impulse buying.

We need is more "push" payment systems. They are inherently more secure than "pull" since the customer controls the process.

This is how it works in Germany. You order something and the merchant provides their account number and an order number. You login to your online banking, and send the money. Done.

Fast, inexpensive, simple and secure. One big reason why PayPal and credit cards aren't popular in Germany.

That is pretty much how the dominant payment system in the Neterlands works (iDEAL):

1. The merchant shows a list of banks that support iDEAL (all major banks, currently 8)

2. You pick yours, the merchant sends you to your online banking environment

3. You log into to your bank account (with your username and password)

4. You review the proposed transaction

5. A transaction code is sent to your mobile phone which you have to enter (alternatively, a list with numbered transaction codes is sent to you using snail mail in advance, the website gives you the transaction code it wants which you'll have to offer; transaction codes are used only one time)

6. The transaction is made instantly and confirmed with the merchant. To the merchant's advantage, the transaction is irreversible.

The total cost can be as low as 45 cents for the merchant, with no fixed or upfront costs.

Steps 2 and 3 sound like a great phishing opportunity.