Hi Tomas, you have created your form in Google Forms. You must set the currency in the form when customizing it using the Neartail addon. If you have logged in with multiple google accounts in your browser, sometime you might get a permissions error. Open an incognito window in your Chrome browser > open your form in Google Forms > click on the addon icon > click Neartail > click Calculate order amount > select the currency, enable format prices option, click Next > select the Calculate from price option, click Next > click Customize > Edit page will open in a new tab > you can then enable payments. The addon will automatically add a short question with the TOTAL() formula to calculate the amount.