Webhooks

Documentation Index

Fetch the complete documentation index at: https://docs.fynn.eu/llms.txt

Use this file to discover all available pages before exploring further.

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Security: X-Webhook-Signature

hash_hmac('sha256', $body, $webhookSecret)

• $body: The unchanged JSON body of the webhook request (as a string)
• $webhookSecret: Your secret key for this webhook

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Examples

$webhookSecret = 'your_webhook_secret';
$body = file_get_contents('php://input');
$signature = $_SERVER['HTTP_X_WEBHOOK_SIGNATURE'] ?? '';

$expectedSignature = hash_hmac('sha256', $body, $webhookSecret);

if (!hash_equals($expectedSignature, $signature)) {
    http_response_code(401);
    exit('Invalid signature');
}

// Processing ...
http_response_code(200);
echo 'OK';

using System.Security.Cryptography;
using System.Text;

string body = await new StreamReader(Request.Body).ReadToEndAsync();
string signature = Request.Headers["X-Webhook-Signature"];
string secret = "your_webhook_secret";

using (var hmac = new HMACSHA256(Encoding.UTF8.GetBytes(secret)))
{
    var hash = hmac.ComputeHash(Encoding.UTF8.GetBytes(body));
    var expected = BitConverter.ToString(hash).Replace("-", "").ToLower();

    if (expected != signature)
    {
        return Results.Unauthorized();
    }
}

// Processing ...
return Results.Ok();

    const crypto = require('crypto');
    const express = require('express');
    const app = express();

    app.use(express.text({ type: 'application/json' }));

    app.post('/webhook', (req, res) => {
        const webhookSecret = 'your_webhook_secret';
        const signature = req.headers['x-webhook-signature'];
        const expected = crypto
        .createHmac('sha256', webhookSecret)
        .update(req.body)
        .digest('hex');

        if (signature !== expected) {
            return res.status(401).send('Invalid signature');
        }

        // Processing ...
        res.send('OK');
    });

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Supported Events

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Product

• product.created
• product.updated
• product.deleted
• product.archived

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Discount Codes

• coupon.created
• coupon.updated
• coupon.deleted
• coupon.toggled

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Customers

• customer.created
• customer.updated
• customer.archived
• customer.unarchived
• customer.deleted
• customer.merged — Triggered when multiple customers have been merged into one.
• customer.parent.assigned — Triggered when a parent customer was assigned in the organization hierarchy.
• customer.parent.removed — Triggered when a parent customer was removed from the organization hierarchy.
• payment_method.created
• payment_method.updated

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Invoices

• invoice.created
• invoice.finalized — Triggered after the invoice is finalized and payment processing has been initialized. The invoice will have status STATUS_UNPAID at this point.
• invoice.credited
• invoice.updated
• invoice.refunded
• invoice.canceled
• invoice.paid
• invoice.closed
• invoice.unpaid
• invoice.remindered
• invoice.requires_approval
• invoice.payment_method.updated
• invoice.pdf.generation_requested

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Price Plans

• price_plan.archived

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Subscriptions

• subscription.activated
• subscription.billed
• subscription.created
• subscription.changed
• subscription.invoice_address.updated
• subscription.delivery_address.updated
• subscription.payment_method.updated
• subscription.item.instant_metered
• subscription.item.metered
• subscription.item.quantity_changed
• subscription.products.ordered
• subscription.trial_expired
• subscription.trial_extended
• subscription.updated
• subscription.paused
• subscription.voided
• subscription.resumed
• subscription.canceled
• subscription.cancellation_revoked
• subscription.terminated
• subscription.phase.created
• subscription.phase.completed
• subscription.transferred
• subscription_item.terminated

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Dunning

• dunning_document.created
• dunning_document.paid
• dunning_document.canceled

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Cart

• cart.completed
• cart.paid

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Bank Accounts

• bank_account.synced

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Features & Entitlements

• feature.created
• feature.activated
• feature.archived
• entitlement.state.updated

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Notes