lingsDev review for One Click Upsell ‑ Zipify OCU

The supports are not well-trained to deal with tech issues, and the tech specialists seems busy. I had an issue of the invoice email trigger and they took several days to response me 3 times while I kept updating them my conversation with the shopify support. And from the responses I am feeling they have no idea how the app works with Shopify system to trigger notification emails. Besides, there was an urgent issue that the app conflicted with another discount app, which resulted many customer complaints. The support was not able to help me out and the specialist is not available at the moment. They even didn't suggest me to turn off the app to see if it works, and finally I resolved the issue by turning off the app.