Debugging Payment Webhook Failures in ASP.NET Core

Source: Dev.to

Payment integrations are common in modern applications. Services like Stripe, WorldPay, and other gateways rely heavily on webhooks to notify your system about events such as successful payments, failed transactions, refunds, or subscription updates.

While implementing these integrations in ASP.NET Core, one issue frequently encountered is debugging webhook failures. When a webhook fails, it can be difficult to understand:

• What payload was received?
• What event type triggered the webhook?
• Did the processing fail?
• What error occurred?

Without proper logging, troubleshooting becomes frustrating.

The Problem with Webhook Debugging

Most payment providers send webhook events with a large JSON payload. For example:

{
  "id": "evt_123456",
  "type": "payment_failed",
  "data": {
    "object": {
      "id": "pi_987654",
      "amount": 5000,
      "currency": "usd",
      "status": "failed"
    }
  }
}

If something goes wrong during processing, you usually need to:

• Inspect logs
• Check database records
• Reproduce the issue locally

However, many applications do not store the original webhook payload, which makes debugging even harder.

A Simple Approach to Solve This

A practical solution is to log every webhook event into a database. For each event you can store:

• Payment provider (Stripe, WorldPay, etc.)
• Event type
• Processing status
• Reference ID
• Original payload
• Error message
• Timestamp

This allows you to quickly inspect what happened when a webhook fails.

A database table might look like this:

Example ASP.NET Core Endpoint

A simple API endpoint can be used to log webhook events:

[HttpPost("log-payment")]
public IActionResult LogPaymentEvent([FromBody] PaymentEvent paymentEvent)
{
    _repository.Save(paymentEvent);
    return Ok("Payment event logged successfully");
}

This endpoint receives webhook data and stores it for later inspection.

Benefits of Logging Webhook Events

• Easier debugging of failed payments
• Historical record of payment events
• Ability to inspect raw payloads
• Faster troubleshooting in production
• Better visibility into payment flows

For teams handling payment integrations, this type of logging can save significant time.

A Small Tool I Built for This

I created a small ASP.NET Core template that logs payment webhook events into SQL Server. It provides:

• A simple REST API for logging payment events
• SQL Server storage for webhook payloads
• Structured logging of errors and statuses
• Lightweight setup for debugging payment integrations

GitHub repository:

Complete implementation (paid):

When This Approach Is Useful

Logging webhook events is especially useful when working with:

• Payment gateways
• Subscription billing systems
• Event‑driven architectures
• Third‑party integrations that rely on webhooks

It ensures that important external events are captured and traceable.

Final Thoughts

Webhook integrations are powerful but can be difficult to debug without proper visibility. By logging payment events and storing the original payloads, you can dramatically improve the reliability and maintainability of your payment workflows.

If you frequently work with payment integrations in ASP.NET Core, a simple webhook logging mechanism can make debugging much easier.