Shopify and Amazon SKU Error Corrections

**** DO NOT APPLY IF YOU DO NOT HAVE EXPERIENCE INTEGRATING SHOPIFY AND FIXING ERRORS **** We have a shop with almost 1000 items that are all print on demand from Shopify app companies (Printful, Printify, etc). They are all live on our shop already. We need these items to integrate to our Amazon seller account. **** THEY ARE ALREADY IN SHOPIFY AND ALREADY WE HAVE TRIED TO INTEGRATE BUT CANNOT DO TO ERRORS **** You are NOT adding new products. You are fixing current products so that they integrate to Amazon. I have tried to do myself and several hundred are up but there are errors on the others, mostly because of manufacturer listings. I do not know how to fix any of this and don't have more time to learn but for someone who does know how to run a Shopify site, this should be a simple fix all around. We use apps on Shopify to integrate, Codisto for Amazon. Products are made on demand by Printful and Printify. We are getting errors on our Amazon listing for descriptions and UPC / SKU. These are ridiculous as we have these things / have followed the company listing as the app software requires. So we want to hire someone to get it all up and running. Please do *NOT* apply if you do not have Shopify integration experience. We have lost time and money on freelancers who say they know how to do the work but then do not. This is a charity job with a fixed budget of $100. Yes, we know it's low, but it's all the charity has to hire with. Higher bids will not be considered. We are looking for someone we can work long-term with and hire part-time to run the shop once we are able to sell items and bring in income.