Mailgun Webhooks WebAPI Endpoints

public bool IsValid(WebhookRequest request)
{
    var hmac = new HMACSHA256(Encoding.ASCII.GetBytes(_apiKey));
    var signature = hmac.ComputeHash(Encoding.ASCII.GetBytes(request.Timestamp + request.Token));
    var generatedSignature = BitConverter.ToString(signature).Replace("-", "");
    return generatedSignature.Equals(request.Signature, StringComparison.OrdinalIgnoreCase);
}

To test Webhooks with online data, you need to expose your local website on internet. Here is a nice clean way to do it with Visual Studio and IIS Express.

• Open MailgunWebhooks WebAPI solution in Visual Studio.
• Open %YOUR WORKSPACE%\MailgunWebhooks\.vs\config\applicationhost.config
• In applicationhost.config look for your Site xml node
• If 65008 is your port, add the following line

<binding protocol="http" bindingInformation="*:65008:" /><bindings> 

• Example

<site name="MailgunWebhooks" id="2">
    <application path="/" applicationPool="Clr4IntegratedAppPool">
        <virtualDirectory path="/" physicalPath="C:\Workspace\csharp\MailgunWebhooks\MailgunWebhooks" />
    </application>
    <bindings>
        <binding protocol="http" bindingInformation="*:65008:" />
        <binding protocol="http" bindingInformation="*:65008:localhost" />
    </bindings>
</site>

• Open %YOUR WORKSPACE%\MailgunWebhooks\packages.config and replace port 65008 with your port
• Run your solution from Visual Studio (F5)
• Open your terminal and navigate to the solution folder to install the npm packages and run start

npm install

npm start

• The output of "npm start" should be similar with the following:

> mailgun-webhooks@1.0.0 start C:\Workspace\csharp\MailgunWebhooks
> lt --port 65008 --open

your url is: https://elemuzzmps.localtunnel.me

• The presented url should be opened into your browser

In web.config, change the value of Mailgun key with your Mailgun key

<add key="MailgunKey" value="#########" />

Configure the webhooks on the mailgun website similar to:

• https://elemuzzmps.localtunnel.me/api/mailgun/event/deliver
• https://elemuzzmps.localtunnel.me/api/mailgun/event/drop
• https://elemuzzmps.localtunnel.me/api/mailgun/event/bounce
• https://elemuzzmps.localtunnel.me/api/mailgun/event/spam
• https://elemuzzmps.localtunnel.me/api/mailgun/event/unsubscribe
• https://elemuzzmps.localtunnel.me/api/mailgun/event/click
• https://elemuzzmps.localtunnel.me/api/mailgun/event/open