How can Implement Goal Cheer mutation, goalMarkAsComplete and goalUpdate functionality in verasion 2

Where are the Goal Cheer mutation, goalMarkAsComplete and goalUpdate used in the product hunt, I tried to make a clone of the product hunt with whatever endpoints are available in public. I explored the product hunt but can't find where actual use of the Goal Cheer mutation ( v2 endpoints ), Is anyone know then can you please guide me?