Send the CC number, month, and year as integers to ActiveMerchant
Send the CC number, month, and year as integers to ActiveMerchant

While only the month had issues with sprintf(), I figure why not cast
all three values as integers, since they indeed should be integers.

A good writeup on the issue I encountered is here:
http://blog.para9.com/post/366096411/printf-and-octal-values

up_the_irons/billing-system-models