I don't currently, but I think it's possible. That said, I'm not sure I'd recommend it. I'm building them since they're a reasonable way to handle auth with my unofficial Google integrations (without the special cookie/cors permissions I'd need to store users' Google credentials).

You're able to change the subscription cost on the fly (I think; I haven't actually done it). The bigger problem is there's no easy way to do price segmentation. This is fine for my consumer product, but I may end up rolling my own payments setup for an upcoming business product.