"How will you know that it was Me who sent the Bitcoin. What details should I provide besides the product I ordered and the amount of money and Bitcoin I sent and what time I sent it? Is there anything else I can do to make sure you can confirm my purchase which I plan to make either today or tomorrow." the Email Reply was "You can Send us your Bitcoin Transaction I.D."
Your explanation is a bit unclear, but assuming the seller only uses each address once, nobody else should use that address. That means any payment received on that address comes from you, so it's very easy to know who made the payment.
Point is I am planning to Buy a Ledger Nano S instead of the X as what someone Posted in a thread somewhere it's just "storage capacity is bigger for the Ledger Nano X".
Be careful here: you should only buy hardware wallets through the official channels.