If you'd like to use a Google sheet to store your opt-in form data, we'll show you how to create a new sheet with the correct format.
Here is how the data will be appended to your Google Sheet when you get a new opt-in.
Email or Phone
Any additional fields you add (i.e. First name)
You'll want the first row to contain your header fields as shown in the image above.
That's it! Once you have the sheet setup, you can select it when setting up your opt-in form.