I've seen local restaurants and takeaways with (presumably) similar contracts with the food-ordering aggregators (Just Eat etc). Some have a clear statement on

I've seen local restaurants and takeaways with (presumably) similar contracts with the food-ordering aggregators (Just Eat etc). Some have a clear statement on the website like "10% discount for ordering by phone", others will apply a similar discount when ordering in person, or will put a 10% off coupon (must order by phone / their own website) in with every delivery.