This article has information about the Google Domains Early Access Programme (EAP). The EAP lets you purchase a domain before it's available in general availability.
Pricing
During the EAP, there's a one-time early access fee in addition to the annual price for the domain. Learn more about Google Domains pricing and supported domain endings.
Refunds
The one-time early access fee is non-refundable. However, the domain registration fee can be refunded within five days of purchase, according to ICANN's five-day grace period policy. Learn more about Google Domains refund policy.