I use Bill.com all the time. The first is from ATh telling you the pay has been submitted. The second is Bill.com notifying you that it is in your account. Don't count on the exact dates. I always get paid. I would speak with someone at ATH to find out about your payment plan. They have to have your account number to pay you.
I have from the beginning of Mystery Shopping, about 12 years now, have a second checking account just for Mystery shopping, never get mixed up with personal accounts. I also transfer all of my PayPal accounts, checks, to this account. Easy!