Hello! Thanks for your interest in the game! I don't know why PayPal is rejecting the transaction, but you can purchase the game on Steam without any problems:
https://store.steampowered.com/app/1686130/Deep_Despair_2/
Alexander Bekker
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A member registered Jun 29, 2016 · View creator page →
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Deep Despair 2 is an open world survival action adventure game.
Adventure