I've read and have heard of both 'as per' and 'per' being used conversationally, both with the same connotation of either 'according to' or 'on authority of'
"Tell Ron to start molding new rollers for the mecanum wheels, as per me"
"Per Mr. Crane, you need to start the molds for the new rollers."
They both establish the same context by setting that something should be done on the authority of someone else (or the speaker, per the first example (see what I did there?)). Or it acts as a way to cite a source of a statement, directive or fact in conversational speech.
My question is, what is, if any, the functional and syntactical difference between as per and per. If there are no differences, which is apropos to use?