I installed this app hoping I could offer my customers a complimentary gift with purchase during a seven day promotional period. After installing this app, I followed the instructions by first setting up the automatic discount (free gift) in Shopify, the next step is 'synchronization' which can take some time. Well I waited and waited (half an hour or so) and every time I clicked the refresh button it came with an error. I can see 'cache' is pending but I don't have time to sit around an await. For me, this app appears easy but it did not work. Onwards and upwards!