If you don’t have an Airbnb account, you can sign up and receive a $40 credit when you complete a qualifying reservation. The usual offer was $25 and recently $35. A Qualifying Reservation must have a total value (excluding guest fees or taxes) of at least $75 (or its local currency equivalent if supported). It must be booked and paid for via the Airbnb platform.
Once you have your own account, you can then refer your friends and family and receive $40 for every referee that completes a qualifying reservation and $75 for every referee that hosts. Users may earn a maximum of $5,000 USD Travel Credit per account. Read the full Airbnb Referral Program Terms & Conditions.