They pay through Bill.com and it will take a little better than two months. (A shop preformed at the end of March should be paid the end of May, if I remember correctly). Since this is your first job with them, you will get an email from Bill.com when Ath submits your payment to them. As soon as you sign up for direct deposit through Bill.com, Bill.com will process your payment.
Ath is one of the most reliable paying MSC's. it will seem slow and awkward the first time, but it will go super-smoothly next time.
Hard work builds character and homework is good for your soul.