A valid credit card is required for Ecomartists to successfully process your orders. If your card is declined, it means your card provider blocked the charge or you went over your limit.
You have a few options:
1) Call your card provider and get them to "whitelist" ecomartists charges
2) Call your card provider and increase your charge limit
3) Use a new card on your EA account
If you need to update the card on file in your EA account, for instructions please visit this link