But of course in the end there will be paperwork done.
If you're thinking about being traditionally published, this will definitely serve as a great guide! She's a Filipino author, repped by Nicole & Rebecca (Helen Rees Agency) and has an upcoming YA horror from SourcebookS.
If however you're wondering about self-publishing in Amazon and how to get your money "out", you will find this FAQ page from Amazon helpful. Basically, you'll need a US TIN and sign up several forms.
Also, keep in mind you are a self-employed individual in the eyes of the law. As for those who are worried that Amazon will somehow take away your money, no - that's not going to happen (glitches don't count since they get fixed sooner or later). Mina V. Esguerra - another Filipino author - says so in her video interview.
Hopefully, these links will help you get started. I'll try to make this post more comprehensive to serve as a complete guide next time.