Presto can notify you of new shops via email, so long as the shopper has set up a hotspot.
The available shops in each of the emails will be sorted by distance from the hotspot, and will show information such as the name or address of the shop and the amount the shopper will be paid.
By clicking on the pin or the View link by a shop, the shopper will be taken to the presto map, centered on that shop's location.
Emails will be sent out everyday, just as long as the shopper has set up a Hotspot.
For more information on setting up a hotspot, check out this article: