Thanks to everyone for all the help and information. We were able to purchase a decal online once we had the Coast Guard number of our bareboat and used the transaction number to log into the ROAM app. Unfortunately, we had difficulty connecting with the video aspect of the app and ended up having to walk to the airport to present per their request. I think they thought I was bringing people over as a paid captain as opposed to just bringing friends along. Not sure if the problem was the Internet on our end or theirs but am confident we would have cleared in easily with the app had the video conferencing worked.