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$blockchain_receive_root = "https://api.blockchain.info/";
$mysite_root = "mysite url";
$secret = "CHANGE_TO_RANDOM_SECRET";
$my_xpub = "CHANGE_TO_XPUB_KEY";
$my_api_key = "CHANGE_TO_API_KEY";
I have api key and xpub key but how to set the random secert key