Step 0: Turn on "Collect VAT ID" option on the dashboard, and saved your settings, after that, the only thing you need to do is to change the label of the Address line 2 field. Easy to set, here are the steps:
Bare in mind that Fakturownia is checking the correctness of NIP address. If this option is enabled, Fakturownia checks automatically the VAT ID (NIP) that is sent by the Shopify app using our Address Line 2 method. And if the format in incorrect, Fakturownia won't create and send a the document. Since most of the buyers don't enter their VAT ID in the correct format, it is recommended to disable this option here
Step 1 - Go to Shopify Admin » Online Store » Themes
Step 2 - Click "Edit default themes content"
Step 3 - Search for "address2" » Edit the labels as you want » Save settings
Done! The checkout page has been updated. "Address line 2" is now labeled as "VAT" as you specified. Since this option is enabled in the dashboard, any data entered in this field by the customer will appear in the VAT section of the generated document.
