Eligibility basics:
- You must be a taxable person (i.e. a business that can deduct VAT).
- You must not be VAT-registered in the country where VAT was paid.
- Supply of goods/services there must be limited to specific exceptions (like certain transport).
Member State rights:
EU countries can:
refuse refunds if there is no reciprocal refund right in your country,
limit which expenses are refundable,
demand a VAT representative.