Shopify

From your Shopify admin dashboard, click on "Apps" on the left side of the screen.

Click on "App and sales channel settings" at the bottom of your app list.

Click on Develop apps

Click on Allow custom app development

Click on Allow custom app development again.

Click on Create an app

It helps to name it something that you'll recognize later.

Name your app. 

Click on Create app

Click on API credentials

This allows you to set granular permissions for the private app. Most private app documentation will tell you exactly which permissions are required.

Configure Admin and/or Storefront API scopes

Check any permissions needed for the private app.

Click on Save

Click on Install app

Now on the "API credentials" tab you'll have the information needed to make the private app work.  Copy/paste the token/key/secret key as needed.

Private apps provide Shopify business owners with extended, personalized store features. These apps are built by third-party developers exclusively for your store. They differ from public apps (which are available to many different stores) or custom apps (which don’t require open API access.)&nbsp; It can also allow for additional data integrations with content management systems other than Shopify, by means of an API. Further, private apps allow store owners to extend their selling capacity to custom storefronts, such as mobile applications, video games, and websites.&nbsp;&nbsp;&nbsp;

How to enable private apps on Shopify

Custom