Etsy seller abroad asked for my tax ID for an invoice—should I worry?

I bought an expensive chuky doll from a well known seller with good reviews. A few days ago they messaged me thanking me for my purchase and that my order is in production. Then they asked for my email, and my tax ID so they could give me and invoice or something. They said if im not comfortable giving it out, then I can make one up. by the way the seller is in another country. I asked this on fb and some people said the seller is trustworthy because they've done business with them before. I don't know though

Etsy seller abroad asked for my tax ID for an invoice—should I worry?
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