Yes we can pay you. However we handle private persons a bit differently:
When asked to enter a company name, simply enter your own name instead.
As for VAT, EU members are only required to enter a VAT number if they currently have one. If you are a EU member, you don't need to apply for a VAT number to use Unity Ads. If you do not have a VAT number, simply enter "none" in the field when prompted.