GPT site

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Hi, so I wanted to code gpt site, for the membership system it was easy and fun to learn (I use PHP), but problem gets with offers. I though that I could use content lockers and give users energy whitch build up every x hours. But whats the deal with content lockers? Do they won't show same offer to user who already completed it? Thats the question I wanted to ask you. P.S. And one more. What content loker do you recomend?