Purchasing one year subscription Credit Card system not accepting card

I tried to make purchases with two different credit cards. And neither would be accepted. They are U.S. credit and debit cards. I double-checked that the cards are ok. Any ideas?

Dear crowdpub,

Thank you for your forum post!

Please see Card Declined By PayPal for all payment-related issues, as well as Bitcoin and other options for premium access.

Thank you again for your forum post!