How can we improve WHMCS?

Enhance the e-mail to show which pay method is being referenced (default or not, for example) could be useful.

Also, to have an option to send expiry email for default method or other.

Clients get confused when they receive an email for an upcoming credit card expiry and they have multiple cards on file and it is not the default one expiring. So if we have the option to send an email showing which card is expiring (default or other), it allows us to send a more specific email since if it is not the default, it will not interrupt their services.