Payment revision needed on amazon?

So I use the amazon app on my iPhone, and a few hours ago I placed an order using a visa gift card that had $30 and my purchase was $18. Now when I go to the your orders section there's a box that says "there's a problem processing one of your orders" and another box says "payment revision needed" and it's asking me to visit the desktop site and fix the problem. I don't know what to do because I do not own a computer and I'm only able to use my iPhone. Will my purchase still be sent with whatever problem is going on? And if not how can I fix this problem?

Maybe your gift card is no more accepted by amazon, you have to update your payment method. Also they won't send your item as it is not paid yet

Use the Web browser on your phone, and visit the Your Account section of Amazon. Set up you payment options.