If you live outside of the US and the supplier requires a sales tax ID, you can provide the supplier with the closest equivalent to a sales tax ID for your country.
For example, if you live in Great Britain or the EU, you will need to be a VAT registered trader so in place of a sales tax ID use your VAT ID. In Australia and New Zealand, you can use your GST.
Alternatively, the wholesaler may want to see your business license/registration details.
Short URL to this FAQ: https://www.salehoo.com/u/icH5H