This app requires you to create a new Merchant Centre account which is not explained anywhere. With invasive code and additional requirements, I can't recommend this at all, given that this is as far as I got after two days of trying to set this up.
We are very sorry about your disappointment. We wished you had discussed your concern with our 24/7 support staff via chat, so we could get your issues solved immediately. It’s important to us that our customers are more than satisfied.
The reason LimeSpot creates a new Merchant Center account is that all our Merchant Center management and optimization is automatically done by our AI engine, which needs to have full control over the account, therefore we avoid co-existing with other feed management software to prevent conflicts.