We are currently working on a feature to extend the period during which a seller can input tracking details, given the buyer’s consent. However, it is a work in progress. Therefore, we must abide by the rule below.
However, if the seller fails to enter tracking details on time, the transaction will be cancelled, and the funds (minus will be returned to the buyer in the transaction.
If this happens, you can always choose to enter into a new transaction again for the same item and price and be sure to enter the details on time the second time around.