Well that's what I thought at first, but then his phrase 'through the till' threw me off, because I don't think of the eftpos machine going anywhere near the actual till, but rather just connected to the bank via a phone line. My mistake.
Each note one at a time in order of most valuable to least valuable, followed by each coin one at a time in order of largest to smallest, followed by the receipt. Ignore the impatient people behind you in the line.