Credit card expiry email subject

This is the subject of the email that is sent when a credit card is about to expire. Available variables are:

• <TMPL_VAR NAME=PRODUCT_NAME> The name of the Product in System -> Configuration or in custom API
• <TMPL_VAR NAME=DAYS> number of days to expiry
• <TMPL_VAR NAME=DAYS_PLURAL> Will take the value 1 if the number of days is not equal to 1, 0 otherwise
• <TMPL_VAR NAME=SERVICE_EMAIL> email of the person set as contact in the customer
• <TMPL_VAR NAME=XXX> Name of any column xxx from table 'customers', referring to the account owner of the credit card
• <TMPL_VAR NAME=YYY> Name of any column yyy from table 'people', referring to the person set as contact