Payday loans are one of the most popular type of finance commonly arranged online, and this popularity is in many ways perfectly understandable. They're quick to arrange and you can often have the money in your account in a matter of hours if your need is urgent enough. There's also generally no credit check during the approval process, and so people with damaged credit ratings need have no fear of their application being rejected.
That said, payday advances can also be something of a mixed blessing. There's no denying that they're one of the more expensive forms of credit around, especially if you translate the charges into an annual interest figure like APR. They can also lead to financial problems in that a chunk of your next paycheck will have to be used to repay the borrowing, and if things are already tight financially then this extra strain can easily lead into a vicious circle of needing to take out credit to repay previous credit - in short, this is a route to financial chaos and even insolvency.