Micro DOT Helmet Co review for Walmart Marketplace

This app does not even deserve the tip of one star. I am trying to integrate my store in Walmart sellers central with my Shopify store, All my products show errors, I added two zeros to the front of the UPC, updated one listing with 14 variables, clicked on save, and it did not save the entered information. I refreshed the page, and redid the whole process twice. I clicked on save, but it did not save it. After wasting 2 hours entering and re-entering barcodes, I am more than frustrated. Walmart please help!!!!