Hello Andrzej,
Our company is incorporated in Hong Kong. The Hong Kong authorities do not issue tax residence certificates for this purpose and we therefore cannot provide you with this document unfortunately.
I'd like to point out however that we have our company registration number and details in all our invoices. This might be enough for what you're looking for.
Apologies for the inconvenience, but we have explored this topic several times as you can imagine, and we are unable to get and to provide you with this certificate.