Return status code 200 on virtual route

I’m working on a plugin to receive payments through Mollie. Part of the payment flow is a call from Mollie’s side to a webhook on my server. I’m able to create a virtual route that acts as a webhook address, I receive the call, but I need to respond with a status code 200 to notify that I received the call and stop Mollie from trying again. How do I do that in Grav, if no actual page corresponds to the webhook route?

What are your virtual route pages currently returning for HTTP status?

It returns a 404, despite the fact that I receive the webhook call and am able to process it.