Activate custom app development Go to Shopify Admin → Settings → Apps and sales channels, click Develop apps, then click Allow custom app development and confirmCreate a new custom app In Develop apps, click Create a custom app, enter an app name (e.g. “Atlas Integration”), and choose the app developer (store owner or staff)
Configure Admin API scopes In your new app, click Configure Admin API scopes, then select only the required scopes: read_customers read_orders read_products
Click SaveInstall the app Click Install app, then confirm by clicking Install Shopify will install the app and generate the credentials immediately
Retrieve your credentials Go to API credentials in the app’s settings Copy the Admin API access token (it’s shown only once) — this will be your API Key