Some payment providers will require a tax ID in order to verify your business and to report your earnings to your local government. It would be best to speak with a local tax consultant to determine if you need a tax ID. If you do need one, then they can provide you with the steps needed to obtain the tax ID.
If you're unable to obtain a tax ID, or if it's deemed that you don't need one, then I would recommend contacting the payment provider you intend to use to determine if you are able to bypass the requirement to provide a tax ID.
Trevor | Community Moderator @ Shopify - Was my reply helpful? Click Like to let me know! - Was your question answered? Mark it as an Accepted Solution - To learn more visit the Shopify Help Center or the Shopify Blog