You have the code. You have the power: "While I fell behind schedule on a few of the deadlines, I feel that, in the end, everyone agrees that a great product w

You have the code. You have the power: "While I fell behind schedule on a few of the deadlines, I feel that, in the end, everyone agrees that a great product was produced relatively on schedule. In addition to the work I initially agreed upon, I incorporated X's suggestions and extended the site further, even though, based on our initial discussions, it was determined to be feature complete. As such, I cannot accept any payment beneath the initially agreed upon amount. If your team is unwilling to pay this amount, I will be forced to take down the site and cancel the service to recoup my losses."