If you're like me, then here's what you do:

1) Spend all of your money. Not hard to do in this economy; just go buy a tank of gas.

2) Do this one day before your payment schedule. Hopefully you won't get paid for a few days yet (but hopefully you have enough potatoes to live off of as well--but if not, see step 4).

3) When the Moogle goes to collect your dues, there will be no monies, and your subscription will be revoked.

4) If you spent your last funds on gas, and didn't have enough potatoes, you might starve to death. Starvation is the #1 reason dead people can't fund their banks, which is a great way to have services like your FF subscription suspended.