Several of the Mac apps that I consume seem to use Paddle for licensing, and this seems to solve your issue in regards to the machines likely to run this.
I have absolutely 0 experience with it but from their website it seems like they handle "everything", if that's what's usually understood by being a Merchant of Record.
I have absolutely 0 experience with it but from their website it seems like they handle "everything", if that's what's usually understood by being a Merchant of Record.