I am trying to create automated receive Bitcoin payments via Blockchain API. I have my API key, xpub, everything. I'm using PHP.

Here is the part of my code for generating wallet address:

$scrt = my_super_secret_code_60_chars_long;
$my_callback_url = "http://mysite.com/lib/payment.php?secret={$scrt}";
$my_xpub = "my_xpub_key";
$my_api_key = "my_secret_api_key";

$root_url = "https://api.blockchain.info/v2/receive";
$parameters = "xpub=" .$my_xpub. "&callback=" .urlencode($my_callback_url). "&key=" .$my_api_key;

$result = mysqli_query($conn,$qry);
$row = mysqli_fetch_row($result);
$reci = $row[1];
$uid = $row[0];
if ($reci=='none') {
//if the user does not have generated receive address, triggering this
$response = file_get_contents($root_url . '?' . $parameters);
$object = json_decode($response);

echo 'Send Payment To : ' . $object->address;

$qry= "UPDATE MY_TABLE SET RECEIVE_ADDR='". $object->address ."' WHERE WALLET = '{$_GET['wallet']}' ";

This code works, but I have a problem with the callback to payment.php. It's not triggering when the payment is received, however manually, I can simulate the received payment by calling PHP with correct parameters.

Here is the relevant part of payment.php:

$scrtt = $_GET['secret']; //password is passed back to the callback URL
$transaction_hash = $_GET['transaction_hash'];
$value_in_satoshi = $_GET['value'];
$value_in_btc = $value_in_satoshi / 100000000;

$gt='CALLBACK CALLED - TXID:'.$transaction_hash.' VALUE '.$value_in_satoshi.' SCRT:'.$scrtt.' CONFIRMS:'.$_GET['confirmations'];
$qry= "INSERT INTO DEBUG (TE) VALUES ('{$gt}')";
//code above is for debugging - but not triggered however payment is received
if ($scrtt== my_super_secret_code) {
if ($_GET['confirmations'] >= 2) {

$result = mysqli_query($conn,$qry);
$row = mysqli_fetch_row($result);
$uid = $row[0];

$qry= "SELECT TXHASH FROM PAYMENTS WHERE TXHASH = '{$_GET['transaction_hash']}' ";

$result = mysqli_query($conn,$qry);
$row = mysqli_fetch_row($result);
$tx = $row[0];

if ($tx <> $transaction_hash) {

    $qry="INSERT INTO PAYMENTS (TXHASH,USER_ID,SATS,CONFIRMS) VALUES ('{$transaction_hash}',{$uid},{$value_in_satoshi},{$confirms})";

//new tx - insert   

//Insert into confirmed payments

echo '*ok*';

My problem is, the callback is never called— can anyone check my code and tell me where I the problem is?



I investigated a little and here is my result (however it's still not working)

I found the url to check a callback log directly on the blockchain: https://api.blockchain.info/v2/receive/callback_log?callback=http-urlencoded_my_website/callback.php?parameters&key=my-api-key

The log shows me something like that:

callback":"http://mysite.com/callback.php?param=myparam","called_at":"2017-03-10T13:05:39Z","response_code":403,"raw_response":"<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n<html><head>\n<title>403 Forbidden</title>\n</head><body>\n<h1>Forbidden</h1>\n<p>You don't have permission to access /callback.php\non this server.<br />\n</p>\n<p>Additionally, a 403 Forbidden\nerror was encountered while trying to use an ErrorDocument to handle the request.</p>\n</body></html>\n"}]

Can someone help me with that? I am an owner of this domain and I can access this page with all of my browsers.

  • 1
    I would just like to point out that your code is vulnerable to SQL injection. Are you definitely sure that the code inside if ($reci=='none') { actually gets executed? – Adam Lindsay Mar 9 '17 at 18:21
  • $reci is a variable that is assigned from user's actual receive address from mysql database.. and the default value for that field is 'none' .. I tested it many times and yes, it works.. this if clause is avoiding double generate BTC address for single user – Fero Mar 9 '17 at 18:48


It started to work, after removing .htaccess file from /public_html on my webpage.. so simple solution..

i think it can be done with some reconfiguration too, but i am not using .htaccess, so it was the simpliest solution for me :)

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