With all this talk about billing and client areas, I figured now would be a good time to put this domain up for sale. The domain is BillingLayer.com, registered February 25, 2012 at GoDaddy, then transferred to Namecheap. With the transfer, the expiration is February 25, 2014. You can make what you want of the name, I kind of think of web services as having "layers" - the adminstration layer, the billing layer, the user layer. All these stack up to make your service. And this domain could be put to use for a software that takes care of the billing layer.
So:
Registered: February 25, 2012
Expires: February 25, 2014
Registrar: Namecheap
Starting price: $5
Increments: $2
BIN: $50
Auction ends Thursday, May 9, 2013, at midnight GMT.
Push to Namecheap user after payment by PayPal, or transferred for $7 plus buying price.
P.S. First auction!