I was looking for a solution for that problem, but couldn't find one.
I have my base website on Wordpress and from that point I'm sending my customers to Shopify website when they enter my store. To make the feeling more immersive I want both sites to visually look the same. I have some data like ex. menu items stored in Wordpress database and I want to get that variables into my Shopify store. So just to sum up - I want to get access to data from external wordpress mysql database inside my Shopify store. Usually I'd do that with php, but Shopify is not supporting it.