How to receive JSON payload from HubSpot webhook in PHP

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1

I’m having trouble capturing webhook data from HubSpot in my PHP script. When I test the webhook URL using online tools like requestbin, I can see the JSON data being sent correctly. However, when I try to capture this data in my own PHP code, nothing gets written to my file.

Here’s what I’ve been trying:

$logFile = "webhook_data.txt";
$handle = fopen($logFile, 'a') or die("Cannot open file");

fwrite($handle, print_r($_POST, true));
fwrite($handle, print_r($_GET, true));
fwrite($handle, file_get_contents('php://input'));
fwrite($handle, $_POST['data']);

fclose($handle);

No matter what approach I use, I can’t seem to grab the incoming webhook data. I’m wondering if there’s something specific about how HubSpot sends webhook data that I’m missing. Should I be looking for a specific parameter name when the JSON arrives? Is there a standard way that webhook APIs typically send their JSON payload?

Any suggestions on what I might be doing wrong would be really helpful.

2

Had this exact problem a few months ago with HubSpot webhooks. HubSpot sends webhook data as raw JSON in the request body, not form-encoded POST parameters. Your file_get_contents('php://input') approach is right, but you need to decode the JSON first. Try this: ```php
$json_payload = file_get_contents(‘php://input’);
$data = json_decode($json_payload, true);

$logFile = “webhook_data.txt”;
$handle = fopen($logFile, ‘a’);
fwrite($handle, date(‘Y-m-d H:i:s’) . " - " . $json_payload . “\n”);
fclose($handle);

Make sure your webhook endpoint is publicly accessible and returns a 200 status code. HubSpot marks webhooks as failed without a proper response. Add some error logging and check your server's error logs for PHP errors that might be breaking the script.
3

This is super common with HubSpot webhooks - I hit the same issues when I started using them last year. HubSpot sends webhook data with specific HTTP headers that can mess with how your server handles the request. Nine times out of ten, it’s the Content-Type header causing problems. HubSpot sends webhooks as application/json, but some server setups don’t handle this right. Try adding header checks to your script: ```php
$headers = getallheaders();
$content_type = isset($headers[‘Content-Type’]) ? $headers[‘Content-Type’] : ‘’;

$raw_data = file_get_contents(‘php://input’);
$webhook_data = json_decode($raw_data, true);

file_put_contents(‘webhook_log.txt’, date(‘c’) . ’ - Headers: ’ . print_r($headers, true) . ’ - Data: ’ . $raw_data . “\n”, FILE_APPEND);

Also check if your hosting provider blocks certain HTTP methods or has security modules interfering with webhook delivery. Shared hosting services love to filter POST requests aggressively.