Hi there,
The difference between DLP and US service is quite huge.
In US photo pass system. Don't need to explain, sure you know.
At DLP, you have in all fixed photo locations with a photographer which can take the picture with your own camera or/and use his or her as tennisfan wrote.
Once the photographer took one or several pics, he/she gives you a paper with a number. You are invited a few hours later (delivery time becomes shorter and shorter) to go to a specific shop and see your picture (corresponding to number given earlier) and decide if you buy it or not.
Sometimes special offers do come out. For example : if you buy 2 characters pictures, you can get the 2nd with a discount. Or you can also get a free frame, etc...