Why would I use this when polar.sh exists? Seems like just another entry into this space. Also, you should probably change the title of this post because this

Why would I use this when polar.sh exists? Seems like just another entry into this space. Also, you should probably change the title of this post because this isn't a payment processor, you are not processing payments in any way at all. You're just a middleman with a UI, and a nice UI can be good, but it's not more than that.