A mustsee when doing TF autographs! Testflight signed source quote list..

TF signature is actually also called TF listing, and its full name is testflight. It is actually Apple's official internal testing distribution channel. We all know that the only official channel for iOS users to download APPs is the App Store, but in fact testflight is also an official channel, but the IPAtf signature is used for internal testing.
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