None USA resident Individuals are required to supply an EIN.
The details are in the Contracts and Banking section of Paid book application.
It is a simple application process and best made by telephone. There are threads dealing with this which give full details.
Costs to much to phone teh USA from ??? country - I purchased $10 International phone card to make the call.
I was connected for around 15 minutes. total cost to me was AU$3 plus about 50 cents off the card - whuch went on to give me 3 hours call time to the UK!
The tax ramifications are minimal and most countries have reciprical agreements with the USA, so if Apple withhold tax money.... they tell you the amount and you use that in your annual tax return, when you add you book income, you do not pay double tax.
I have yet to see a post on any of the iBooks / iBooks Author rrelated support groups - about tax issues after 12 months sales details are returned on the sellers tax return.