Attention: You are not safe if you are accessing the deep web links without.
So, the fake credit card numbers cannot be used for real transactions, but only for testing purposes.
When these surveys are completed, you earn redemption points for cash via PayPal.
Time-delays possible but not very user-controlled.
Complete surveys and redeem points for PayPal cash or for gift cards from Amazon and Walmart.
Later, the buyer will try and make contact, telling you that he paid a little extra and would be grateful if you could return the difference.