Shopify Apps can be largely just API calls using any language/framework you'd like, or you can use their Embedded App SDK which is more JS-heavy. I built the Cu

Shopify Apps can be largely just API calls using any language/framework you'd like, or you can use their Embedded App SDK which is more JS-heavy. I built the Custom Fields app with Drupal 8 and PHP 7. I chose that stack because that's what we work with on a daily basis as a web-dev agency.