You can add an email address to the BCC field of your invoice emails by following the simple steps below.
Step 1: Open Simple Invoice from your Shopify store’s “Apps” section.
Step 2: Click on “Settings” on the Simple Invoice dashboard.
Step 3: Scroll down to the Sending Options section, click on the BCC field, type the email address, and hit the “Enter” key to save the email address.
Step 4: Click on the Save button.