Roblox auto decline call

autoDecline.js

const userIdsThatCanCall = [];

const client = Roblox.RealTime.Factory.GetClient();
client.Subscribe("CallNotification", callDetail => {
    if (callDetail.Type === "NewCall" && 
        (callDetail.CallerId !== Roblox.CurrentUser.userId && !userIdsThatCanCall.includes(callDetail.CallerId))
    ) {
        CoreUtilities.httpService.post({ 
            url: "https://apis.roblox.com/call/v1/decline-call", 
            withCredentials: true 
        }, { callId: callDetail.CallId });
    }
})

Where do i put this code?