This is exactly what I needed! I tend to send a proposal which auto-calculates the total for the customer, but unfortunately, that tool doesn't have a payment gateway. This is the perfect tool to be able to send a payment link to a customer for speaking engagements once the proposal is signed without overburdening them with "paper." I'll likely also start using this for some local services I provide to avoid the in-person payments.

Could it be beefed up with extra features? Sure. But there's something to be said for simple tools that you can keep in your back pocket and make your life easier.