I came across this while reading through Communication for Business by Shirley Taylor;
The usage of "As per..." (Usually found in formal letter writing)
According to Shirley Taylor, it is old-fashioned and overworked. We should not use 'per' in our writing.
As per your request.... say 'As you requested'
As per your agreement... say 'As we agreed'
As per your instructions... say 'As you instructed'
well... that's all... hope it's useful for you....