I've tried two different cards that I know for a fact have money and neither works. I can add the card a-okay, but once I want to add funds it says "The credit card information is not valid. Please check your entries carefully". is the psn under matience or something?
COME ON, PRINNY FOR PASBR!!
Here is a support article with common credit card issue troubleshooting on the PSN:
Please try these and let us know how it goes.