Where can I get Shopify API Password?
To get the new Shopify API token, navigate to Apps -> Develop Apps -> Create App.
Choose the Configure Admin API scopes, tick all the checkboxes, and click the Save button.
Install the App and get the Admin API access token that can be used on the migration wizard.
If the Admin API access token is created already, log in to your current Shopify store admin interface. Navigate to Apps → Develop apps. Choose your store -> Manage credentials.
Note: To protect your data, you’ll only be able to reveal your Admin API token once. In case you need to create a new API token, press the Uninstall app button -> Uninstall -> and get the new token.