My payment method is declined

I need to update a few apps on my phone, but the App Store asks for me to update my payment information. After submitting the information, it says my payment method was declined, please enter valid payment method information. I have tried checking if I had any unpaid balances and one of the apps I downloaded has been pending since Aug, 09. On the top of that page, it tells me my payment method can't be authorized and tapping on it will lead me back to my billing info page.