Heading to Laos from Udon this afternoon, do I need any photos or anything to get stamped in or can I just pay and get it?
TLDR : Answer Summary
To enter Laos from Udon, you generally need 1 passport photo for a visa on arrival. However, if you don't have a photo, you can usually get one taken on-site for a small fee. If you plan to apply for a Thai visa while in Laos, you'll need an additional 2 passport photos.