A Must for VISA Card info for AppleID

hi all,

I have a few I-Pad2 for company use. I have just registered the Apple ID for updating Apps and OS for these I-Pads2. But When I login to iTunes, it forces me to input VISA Card information. As we are not planning to buy apps but for updating Apps and OS only. Is there any ways I need not to input VISA card info and can update the Apps and OS using my AppleID.