Tell me, do they require a return ticket or reservation upon arrival in Bangkok and what else can they ask?

[Dmytro]

Tell me, do they require a return ticket or reservation upon arrival in Bangkok and what else can they ask?

[Ali]

If for the purpose of tourism, then they should be. You can be asked them and then you have to show them. Especially the return ticket. But at the request of the border guard, he may not ask. If you are not a tourist or you have a visa, then there are no questions.

[Mari]

They didn't ask us anything at all, they put a stamp silently.