You received AOR from who? Canada Post or CIC? If it was Canada Post, then that is not AOR, it was Canada Post just letting you know they delivered your package to its destination. AOR comes from CIC. When CIC receives your application, they put a date stamp on it, then a VO will check it for missing documents and signatures. Once your application is found to be complete, then AOR will be sent to you via email (if you have provided CIC with a valid email address in your application ) or mail. The AOR will also include your UCI file number.
Oh thanks for explaining that to me, it is an e-mail from CIC but for an official receipt for the payment