Looking for Twitch prime clarification

Riot is offering free twitch prime loot to all who link their accounts together which consists of skins, shards etc. Although the process is done in 3 easy steps i am looking for clarifcation on the actual loot itself. Is the loot gained automatically or is it a 1 time offer for it, it will not allow me to claim it again and so i am unsure of what the actual offer is.
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