I was exploring Super Bell Subway, and as it turns out, there are a lot of small and easily misable references to Princess ORANGE and Peach & Daisy Royal Patisserie in MK8.
Proof of Peach & Daisy Royal Patisserie selling some kind of soda
In some of the vending machines, you can see bottles with the logo on it.
Peach & Daisy Royal Patisserie may be affiliated with Galaxy Air
As seen on a poster, a Galaxy Air icon appears alongside an advertisement for Sweet Sweet Canyon.
Princess ORANGE may be affiliated with Peach & Daisy Royal Patisserie
As seen on a sign in the Coconut Cafe, they are advertised alongside each other.
Finally, here are some signs on which the 2 brands appear on.