What is a Postcard ID and where can I get one?
A Postcard ID is a little code that uniquely identifies a postcard in Postcrossing. It is composed of two parts: two letters (the country code) and a number. For example: US-12345678.
To get a Postcard ID, simply request to send a postcard and the Postcard ID for that specific postcard will be provided to you. It is important that you always write in each postcard its corresponding Postcard ID — that is what allows the recipient to register it in Postcrossing.
Please note that only postcards exchanged through Postcrossing have Postcard IDs. Any direct swaps you engage in with other members do not have Postcard IDs, nor are they tracked by Postcrossing in any way.