Defining a route inside a lumen package - lumen

I'm working on a Lumen package. In this package I have to define 2 routes for webhooks. What I did is create a routes file, load that through loadRoutesFrom() in my package's service provider, and in the routes file, I defined the route like this:
$this->app->get("/webhooks/decision", \YoungOnes\ArtisanVeriff\Commands\DecisionWebhookCommand::class);
I saw this in an article somewhere as a valid solution, especially since I can't use the routes class. However, when I run this, I get the following:
EntryNotFoundException
/webhooks/decision
How do I define a route from within a Lumen package?

I tried this - it seems to work:
$this->app->router->get()

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I just found a solution for it
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Currently, I defined the routes in the app and do have a "404" (not found) route as described in the docs of the package, but I prefer to have another way which is more correct to solve it.
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I need to create some functions to manage my cookies and some other thing, but I don't know where I should put them in the project so they will be available from anywhere (controller, routes, views...). I looked at the emberjs guide/doc but I can't find anything relevant about that unfortunatelly..
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