CODEWITHSUNDEEP
c#asp.net-mvcstripe-paymentswebhooks
Joel
Joel

Reputation: 19378

Stripe webhooks fail with null entry for parameter 'id'

I'm trying to integrate with stripe.com and webhooks are giving me an issue.

I've created a controller and an action to accept and parse the webhooks from stripe:

public class WebhooksController : AbstractController
{
    public JsonResult Stripe(int id)
    {
        // some parsing code
    }
}

This is routed via

routes.MapRoute("webhooks", "Financial/Webhooks/{action}/{id}", new { "Webhooks", "Index", id = "" }, new string[] { "MyApp.Controllers.Financial" });

I can hit this route fine from the browser or with

curl -i -H "Host: mydomain.com" -H "Content-Type: application/json" -X POST http://{resolvedIP}/Financial/Webhooks/Stripe/4

However, when I try to fire the webhook from stripes dashboard using the "test webhook" feature, I get a 500:

The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.JsonResult Stripe(Int32)' in 'Drg.M3.Client.Controllers.Financial.WebhooksController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter.

According to one staff member in the stripe chatroom the webhooks are sent with something like this:

curl -i -H "Host: mydomain.com" -H "Content-Type: application/json" -X POST http://{resolvedIP}/Financial/Webhooks/Stripe/4 -d '{big ol' json object}'

Why would a request with data fail at routing when one without the data goes through?

Upvotes: 0

Views: 1680

Answers (1)

Joel
Joel

Reputation: 19378

Solved.

Turns out, that when MVC sees a content type of application/json it tries to auto bind the data to your action parameters.

Since the json object Stripe sends includes

{
  "id" : "evt_0000000000",
  ...
}

The id parameter was getting set to evt_0000000000 instead of 4.

Upvotes: 1

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