Simprosys Google Shopping Feed

A very useful application that helped me overcome Shopify's conversion tracking double-counting bug. We have been using it for 2 years, and I've used it for tracking ads across multiple platforms. It's very simple to use, and they keep updating it regularly.
Additionally, their customer service is extremely responsive and attentive. This is one of the best experiences we've had with a Shopify app. I truly love it.