For Chats

In folder ..\Terrasoft.WebApp\ServiceModel create file VvtTalkdeskChatWebhookHandler.svc and add the following code

<% @ServiceHost Service = "Terrasoft.Configuration.VvtTalkdesk.Services.VvtTalkdeskChatWebhookHandler" Debug = "true" Language = "C#" %>

In the files ..\Terrasoft.WebApp\ServiceModel\http\services.config and ..\Terrasoft.WebApp\ServiceModel\https\services.config add the following block <services>:

<services>
    ...
    <service name="Terrasoft.Configuration.VvtTalkdesk.Services.VvtTalkdeskChatWebhookHandler">
        <endpoint name="VvtTalkdeskChatWebhookHandlerEndPoint"
            address=""
            binding="webHttpBinding"
            behaviorConfiguration="RestServiceBehavior"
            bindingNamespace="http://Terrasoft.WebApp.ServiceModel"
            contract="Terrasoft.Configuration.VvtTalkdesk.Services.VvtTalkdeskChatWebhookHandler"
        />
    </service>
</services>

In the file ..\Terrasoft.WebApp\Web.config add block<location> to section <configuration>:

<configuration>
...
<location path="ServiceModel/VvtTalkdeskChatWebhookHandler.svc">
    <system.web>
        <authorization>
            <allow users="*" />
        </authorization>
    </system.web>
</location>
...
</configuration>

In the file ..\Terrasoft.WebApp\Web.config change attribute 'value' in the section<appSettings>:

<configuration>
...
<appSettings>
...
    <add key="AllowedLocations" value="[previous values];ServiceModel/VvtTalkdeskChatWebhookHandler.svc" />
...
</appSettings>
...
</configuration>

Reload the application in IIS