I haven't worked with them at all yet but am signed up with them. This is on their site under My Shopper Score:
Type Points
When you complete a job +10
If you complete a job on the original date specified
(if you change your initial date you will not be awarded these bonus points) +2
When you complete a survey +1
If we need to amend one of your reports -1 for every 10 words amended
If you file your report more than 24 hours after completing a visit -2 immediately and then a further -2 for every additional 24 hours
If we have to contact you in respect of a question in your report -1 for every question
If you release a job -2
If we are forced to release a job from your account -2
If we have to arrange to revisit the premises as a result of an error on your report -10
If we are unable to contact you following the receipt of your report -1 for every 3 messages we leave for you
So to answer the OPs question: it looks like they award points for shops completed accurately, or at least they say they do.