$blockchain_receive_root = "https://api.blockchain.info/";
$mysite_root = "mysite url";
$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


The secret can be anything you want it to be. It's intended to prevent malicious users from running your callback URL manually.

Your callback will do a check similar to:

if ($secret !== "mycoolsecret") { die (); }

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