I certainly don't prefer per or even as per @kris. The stated examples of use given by the OP are obscure and indistinct statements so weak of meaning that I suspect they are not used by a native speaker with any depth of experience or culture. Lewis Goudy's answer is the most relevant response here. Everyone else seems to just be stating their personal preferences for weak modern usage with ...
Use of 'as per' vs 'per' - English Language & Usage Stack Exchange
What is the difference between the following two sentences? She goes to the forest three times per week. She goes to the forest three times a week.
meaning - Difference between "per" and "a" - English Language & Usage ...
The room costs 40 € per person. In this case, per has a meaning for for each. This matches with the main question as asked in the topic title, but doesn't with the example given in the thread itself: per John, as you never charge something per John, haha. There's another case where per would fit both your examples. Like this:
meaning - What does "Per [person's name]" mean? - English Language ...
The word "per" carries the implication (as in percent) that there is a division going on - so if someone says to me "I'll tell you the number of widgets manufactured per employee" I'm expecting one number - the total number of widgets manufactured divided by the number of employees.
"By" vs "Per". Which one should I use on expressions like "P&L ...