You can display order tags on your invoices by following the simple steps below:
Since your store can have up to 250 tags (unlimited if you are on Shopify Plus), please create a support ticket and include an example order number with the specific tags you would like us to display on your invoices.
If you would like to display product tags, please click here for more information.
Step 1: Open Simple Invoice from your Shopify store’s “Apps” section.
Step 2: Click on “Support” in the Simple Invoice dashboard, add a message specifying where you would like the tags to appear on your invoices, include an example order number with the relevant order tags, and click “Send”. Or, simply click here.