Marketing tools. For example, your idol has released a new single album, but the major music and video platforms will not release the audio and video resources immediately. At this time, you need to use your purchase voucher or order page to find the album and Fans who read the song or video content on the disc can privately message them your credentials, and they will send you a link so that you can enjoy your idol's songs and videos for the first time. This is a shift.