I can't checkout the item using the MarketPress Plugin

Hi there,

When ever I tried to checkout the item I want to purchase after I put all the information needed, I'm getting this error message: "There was a problem finalizing your purchase. User authentication failed Please go back and try again." Did I missed something? please let me know. I've tried it a few times but it gave me the same exact error message.

Blessings,
Mark
Breakout Marketing, LLC

MarkG@breakoutmarketing.org