You are required to complete the online Immigration and Customs Travel Form, which will be available 72 hours prior to your arrival in Barbados. You can complete the form at a time and place convenient for you. Once the form is completed, the Immigration and Customs receipt, will be sent to the email that you provided in the form. Please save the receipts to your mobile device or print, for presentation to Immigration and Customs, upon arrival.
https://travelform.gov.bb/create
If you’re unable to complete your immigration form online, you can also complete it upon your arrival to the airport in Barbados