Do you want to return the tracking number and carrier information to Shopify? Do the steps below.
1. Click Setting.

2. You will be directed to Settings page. Then, select Checkout.

3. Next, scroll down and click Order Processing.

4. Below the subheading After an order has been paid, choose Automatically fulfill the order's line items.

5. Finally, click Save.

Then a pop-up remarks will appear to confirm that the new setting has been saved.

Congratulations your Label Setting has been updated!