If you are using one of those online transfer services like PayPal (which to all intents and purposes is work machine for money transfers online) then you should know that you can do a bank online money transfer service from your client to your own account. In other words you link your PayPal and your bank account to make transferring money easy and can hold transfers until you decide when it has accumulated to an amount that you are content with.
This is great for people that work online and have customers all over the world. Usually you are not going to want to give out your bank information. Thus, you have them pay your PayPal account, and then transfer it over to your bank. It is a kind of safe middleman.
There are a lot of great things to come out of linking your bank with your online transfer money service. The best thing is that you know longer have to use your debit card online.
If you need money to use online, all you have to do is use your bank online money transfer service, and move the money from your bank to your online account.