The short version
MyBishBash Photobooth is a genuinely good product with no working way to pay for it, no working way to contact anyone about it, and no way for a free user to be told why the thing they just spent five steps configuring did nothing. The rendering engine, the consent architecture and product.js are better than most funded products at this stage. The commercial layer is the problem, and it is not one bug: every paid tier dead-ends, every Business contact route 404s, and a completed free setup saves nothing.
The engineering here is excellent: the rendering engine, the consent design and the pricing setup. The next step is to connect it to revenue: a working way to pay, a way to get in touch, and a clear message for free users.
The first useful move
Reconnect the contact mailto:, decide the checkout state, and stop the silent save from discarding a user's work, in that order, roughly a day of combined effort.