Anyone have experience crossing the border at Vientiane on land and being able to show an acceptable PDF for inward and outbound of Thailand for Non-O Visa application? My plan was just get a grab from Udon Thani airport but that doesn't leave a paper trail. I see I could book a bus to cross the border at 12go.asia but it's such a funky site. Anyone do other means than showing airline tickets? I guess this can apply to crossing at other spots, but just wondering what they will accept as I don't want to have to submit docs a second time.