How do I prove I own the product?

The strongest signal is a verified work email on the product's own domain. If the product lives at example.com, an address at example.com shows the reviewer you are on the inside.

Add one in Settings under Verification: enter the address, then the code we send to it. You can do this before or after you send the claim.

If you do not have an address on that domain, say so in the note on the claim form and explain how you are connected. The reviewer may reply asking for another form of proof.