Since you want to display your Shopify products on your WordPress website, it is important to connect them with each other. In order to do that you will need to generate some Shopify API keys. To generate the API keys I have discussed the process below: First off, go to the Apps tab in Shopify and then click on Manage private apps. Once you have done that, you need to create a new private app. Read more on https://bit.ly/2Fte1VU