I have created an APP that allows me to show products from a certain collection on a wordpress page. It was working fine until yesterday. Now I get a 504 error and I do not know why, as once APP was complete I did not make any changes at all and it was ok. But I got this error yesterday for some reason. Is it something wrong with Shopify API?
You could retrieve 100 products by making an authenticated call to an endpoint like this:
We have some documentation on this here: https://docs.shopify.com/api/product#index