Fog of Wargames review for CS Amazon Integration & Sync

I was really looking forward to using this with my Shopify store but all i get is error messages, tried to validate a different card but then couldn't assign all the market places in one go and they charged me for the privilege of trying to do so each time. added products but can't complete as the old card isn't validated even though the new one is!! road block after road block for trying to set something up that should be simple. I understand the checks but it doesn't help when nothing works on the mobile app or through Shopify!!!