AR: Google Shopping Feed Pro

Using Shopifys own Merchant Center API solution, we experienced a lot of issues: items not being updated automatically within 30 days and therefore beginning expiring mode. Also all products are using GTINs, specific product types, colors, sizes and more attributes - many values did not fire correctly into GMC. Adwordsrobot and Dennis helped us a lot by tailoring item ids, color and sizes. Can only recommend this steady solution instead of API!