As per Definition & Meaning - Merriam-Webster
https://www.merriam-webster.com/dictionary/as%20per
The fact is that both per and as per have existed in English in the sense “according to” for a very long time–since the 15th and 16th centuries, respectively. The choice of which to use (or avoid) is entirely a matter of taste. The more ponderous as per is often found in business and legal prose, or in writing that attempts to adopt a formal tone. It is not incorrect to use, but some find it overly legalistic and counsel avoiding it for that reason.
DA: 6 PA: 34 MOZ Rank: 78