If you have already created your form in google forms, you can publish your google forms and then customize it using the Neartail - payment form addon to enable payments. Open your form in Google Forms > click on the addon icon > click Neartail > click Calculate order amount > select the currency, click Next > select Fixed amount or Calculate from price option, click Proceed > Neartail Edit page will open in a new tab > click Yes to enable payments > Payments settings page will be displayed > configure the preferred payment options and click Save. Once you setup your form, you will have to use the Neartail share link to collect responses.