Google account authentification in webform

Hi,

due to the billing plan change of PODIO, we need to enable external users to create items through webforms. Is there any option to authenticate these users? The items they are creating are TIMESHEETS and we need to avoid situation that anybody can record a timesheet to any other person.

All our freelancers (external users) are using gmail account. I was wondering, if there is an option to use this as an login before submitting the webform to podio.