Does the playstation store require a credit card number for you to use a playstation network card?

i have a playstation network account and i’m planning on buying a psn card. i don’t have a credit card though.
does it work like itunes where you need to enter a valid credit card number first before you can use the gift card or can i just use the psn card immediately without entering a [...]

Why do I need to give my credit card info to sign up for a new Yahoo mail account?

I just tried to sign up for a second Yahoo email account, and after I went through the usual sign-up process, another screen came up saying I needed to provide valid credit card info and proof that I’m 18.
I’m definitely not comfortable providing that info to get a Yahoo account.
What’s going on?

Yahoo services payment by credit card is declined with an alert of reaching transaction limit. What next?

This happened while adding funds to my PhoneOut subcription in Yahoo Voice, by making use of a perfectly valid credit card that was always being accepted earlier by Yahoo. I could not get proper answer to this problem under Yahoo help services.