You can collect a business number from your customers by using the collect tax numbers feature of the Simple Invoice.
Important Information: Inputs won’t be mandatory and can be left blank. These inputs are only designed to collect information and they won’t change anything related to your tax settings.
Please follow 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 Collect Tax Numbers section, and click on the “Configure from Theme Settings” button.
Important Note: You can follow the next steps starting from the 11th second of the video above.