SuoYuC No, besides recording the status, it's also necessary to record the time, for example:
甲 initiated the application (on January 8, 2024 at 16:45)
The party has agreed (on January 10, 2024 at 23:10)
甲 has already issued a QSL card (issued on January 12, 2024 at 14:20).
乙 has already issued a QSL card (on January 13, 2024 at 9:50).
Alpha confirms receipt of the QSL card (received at 10:10 on January 16, 2024).
乙 confirms receipt of the QSL card (on January 16, 2024 at 10:35)
Additionally, a photo upload function could be added for each sender and receiver to indicate their status. For example, if A sends a card, they can take a picture before sending it, and B can take a picture after receiving it. This allows both parties to confirm the exchange, adding a more formal element.