How to purchase TestFlight internal testing? How much does a stable tf signature cost? !!

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 iosTF distribution is used for internal testing.
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Tags/keywords: tf on apple, apple tf signature, iosTF signature, iostestflight signature, apple TF signature
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