I have done many shops with intelli-shop and never had a problem getting paid. On their site you can see the date your report was submitted and then the payment date will show up when it is sent - for me it's usually four weeks which is better than some other companies.
I have always been paid around the 20th of the month after I performed the shop. Its been that way for the past 7 months. Sometimes its a day before or a day after. I believe that's what's listed on their current pay schedule.