If you need help retrieving your Shopify API key, then here are the steps:
1) Log in to your Shopify admin panel.
2) Navigate to Apps.
3) Click on the Manage private apps link.
4) Under the Apps heading, click on the Create a new private app button.
5) On the Create a new private app page, fill out the required app information fields and then click on the Save button.
6) On the Private apps page, click on the name of the app that you want to get the API key for.
7) In the app details page, scroll down to the Admin API section and click on the Create a new API key button.
8) Under the API key section, you will see the API key and the API password.