We just released quick-fix update for Authorize.net Wordpress Payment Terminal which has several bug fixes. 

v1.1 Bug fix update:
– fixed issue with payment description and customer name not passing
– replaced all mysql_ queries with proper wordpress db queries
– replaced mail() function with native wp_mail() for all notifications
– added "thank you message" from settings to the emails and on thank you page
– replaced the_editor() with wp_editor()
– all undefined variables / deprecated messages fixed