How to buy Apple TF signature? How much does TestFlight internal testing cost? !!!

Apple's TF signature is actually a way for iOS applications to be downloaded through Apple's official product TestFlight. The original intention of reliable TF signature is that Apple uses it for internal testing downloads of some apps before release. Taobao, Zhihu, and even Alipay will use this method to provide some customers with distributed downloads before the official release to avoid irreparable problems after the official release. At present, many products will use tf as a distribution method before being put on the shelves due to difficulties in putting them on the shelves and long review weeks.
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Tags/keywords: testflight listing, TF signature, apple tf signature, iostf signature, ios listing
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