MAINHACK

Viewing / Editing File: webhook.php

<?php
// Read the raw POST data
$input = @file_get_contents("php://input");
$event = json_decode($input, true);

// Verify the signature to confirm it's from Paystack
$secret_key = 'sk_live_c472f0bd96452d599a6bc760e943f1915566d5c9'; // Replace with your Paystack secret key (test or live)
$header_signature = isset($_SERVER['HTTP_X_PAYSTACK_SIGNATURE']) ? $_SERVER['HTTP_X_PAYSTACK_SIGNATURE'] : '';

if (!$header_signature) {
    http_response_code(400);
    exit();
}

// Compute the expected signature
$computed_signature = base64_encode(hash_hmac('sha512', $input, $secret_key, true));

if ($header_signature !== $computed_signature) {
    http_response_code(400);
    exit();
}

// Respond with 200 OK immediately to acknowledge receipt (Paystack retries on non-200)
http_response_code(200);

// Now process the event (do this asynchronously in production if it takes time)
if ($event['event'] === 'charge.success') {
    $data = $event['data'];
    $reference = $data['reference'];
    $status = $data['status'];
    
    if ($status === 'success') {
        // Access basic details
        $amount = $data['amount'] / 100; // Convert to main currency unit
        $currency = $data['currency'];
        $email = $data['customer']['email'];
        
        // Custom form data (if any)
        $custom_fields = isset($data['metadata']['custom_fields']) ? $data['metadata']['custom_fields'] : [];
        
        // Example: Log or update database
        error_log("Successful Payment: Reference $reference, Amount: $amount $currency, Email: $email");
        
        if (!empty($custom_fields)) {
            foreach ($custom_fields as $field) {
                error_log($field['display_name'] . ': ' . $field['value']);
            }
        }
        
        // Add your business logic: e.g., update order status, send email, fulfill service
        // Ensure idempotency: Check if this reference was already processed to avoid duplicates
    }
} else {
    // Handle other events if needed (e.g., charge.failed)
}

// No further output needed
exit();
?>

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Viewing / Editing File: webhook.php

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