QUOTE from http://www.swtor.com/community/showt...32#post5732732
As we are still seeing confusion around the error message received when purchases are not being processed, we are recreating this thread over here with all information from the Cartel Coins FAQ in one place.
Thank you all for your on-going patience.
Naugor | BioWare Customer Service - Forum Support
Why is it that some of my Cartel Coin purchases fail with an error message?
As with any online purchase, Cartel Coin purchases may fail for a variety of reasons. If you have never successfully purchased Cartel Coins, there are a number of things to check which may be causing the error you are seeing
:1.Check that your billing address registered on www.swtor.com exactly matches the address your payment provider has on record for you
2.You must be making the purchase from the same country your payment card was issued from – for example if you are using a US Credit Card to buy coins from Europe, your payment may fail for this reason.
3.Double-check the card information you have provided to be sure that there are no missing or transposed numbers in your card number, CVV number or expiration date.
I hope you're just trolling us for the time being before you tell us all that BioWare is actually going to resolve this issue?.. The issue isn't my or most people's Credit/Debit card or information on the website ect... I can buy the expansion just fine, but not cartel coins. the issue is on BioWares end...