Fakturoid will shut down the old API in April 2025 and therefore is necessary to update your Shopify Fakturoid connection to API V3 before that date.
Don't worry; the update is very easy and fast:
Click on the "Update connection to Fakturoid" button
3. Login to your Fakturoid account
4. Grant access to the Shopify Fakturoid app by clicking the yellow button
5. After few seconds, you are connected and redirected back to the Shopify app
And that's it.