Hi @wagnerona, welcome to the Vercel Community!
Kudos for starting this project 
If your project works correctly locally. I think the issue could be environment variables. Have you tried following this step: Vercel and Shopify Integration?
Hi @wagnerona, welcome to the Vercel Community!
Kudos for starting this project
If your project works correctly locally. I think the issue could be environment variables. Have you tried following this step: Vercel and Shopify Integration?