Akro-webhooks | Stripe Developers | Page 1

paper dome Oct 28, 2021, 9:28 AM

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@honest spoke what do your server logs tell you about the error in your server that results in the 500 getting returned?

honest spoke Oct 28, 2021, 9:32 AM

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2021-10-28 11:03:26
[09:03:26 ERR] HTTP POST /stripeWebhook/webhook responded 500 in 134 ms
System.ArgumentNullException: String reference not set to an instance of a String. (Parameter 's')

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what "bothers" me is that its working in localhost, so It could be that I havn't setup the webhook correctly in stripe dashboard

paper dome Oct 28, 2021, 9:36 AM

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I really have no idea, since that error comes from your code(what is s and why is it null?)

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I'd suggest adding more logging to the production app so you can track down why exactly it's failing and get a stack trace and so on. Off the top of my head there's no immediate idea I would be able to suggest, there's too many possibilities here

honest spoke Oct 28, 2021, 9:38 AM

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S would be:
var stripeEvent = EventUtility.ConstructEvent(json, Request.Headers["Stripe-Signature"], _stripeSettings.WebhookSecretKey);

My guess is the setup i've done locally, isn't being mimic'ed in production

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i.e. the webhook in stripe is not the same as the one running locally with: stripe listen --forward-to https://localhost:5001/stripeWebhook/webhook

paper dome Oct 28, 2021, 9:41 AM

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well the webhook secret will be different at least, the secret is the one you see on the dashboard when looking at the specific endpoint (https://dashboard.stripe.com/test/webhooks) not the one printed by stripe-cli, which is just for that

honest spoke Oct 28, 2021, 9:42 AM

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at Stripe.EventUtility.ConstructEvent(String json, String stripeSignatureHeader, String secret, Int64 tolerance, Boolean throwOnApiVersionMismatch)
at Tooltracker.Api.Controllers.StripeWebhookController.WebHook() in /home/runner/work/tooltracker/tooltracker/Tooltracker-2.0/Tooltracker.Api/Controllers/StripeWebhookController.cs:line 40

It looks like it is in the Stripe Request.Headers, from the snippet I printed above

paper dome Oct 28, 2021, 9:42 AM

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could be other things, like maybe in production you have a proxy/something else which strips the Stripe-Signature header from the request. It really could be many things so the first step is detailed logs to debug things a little more

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sounds to me like one of the arguments you passed to ConstuctEvent is null then

honest spoke Oct 28, 2021, 9:43 AM

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that could be too, yes

paper dome Oct 28, 2021, 9:43 AM

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maybe your configuration setting/store doesn't exist in production in the same way. etc

honest spoke Oct 28, 2021, 9:43 AM

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Isn't the StripeSettings.WebhookSecretKey only set in local

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?

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or do I need to make one for production too?

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omg... I think I have missed the Signing secret...

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It worked, why didn't you just say that Karl! 😄 (just kidding)

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some feedback from a newbie: if you make some kind of visible notifications when users add webhooks in your dashboard, where it states they need to use this new webhook key. I didn't seem to comprehend that a new key was created and I needed to use that in production 🙂

paper dome Oct 28, 2021, 10:03 AM

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great!
and yes people sometimes keep using the stripe-cli secret in production or don't copy the one from the dashboard, that page was redesigned recently but we can always make it clearer!

#Akro-webhooks