I am pertty sure that it is installed correctly- I checked and re-checked that in trying to solve this issue on my own-

Is a GCO Button supposed to appear in the payment methods?

I know that if you use the origonial (Pre GCO) tlp_checkout_confirmation_default that you can get the GCO radio button to appear, but it dosen't work-

I have not installed this on classic yet but I will next-