Unity unlit screen space decal shader for URP. Just create a new material using this shader, then assign it to a new unity cube GameObject = DONE, now you have unlit decal working in URP

Real-time indirect diffuse illuminaton using screen-space information for Unity.

Reusable RendererFeature of MobileScreenSpacePlanarReflection

Screenspace pickables for Maya

Using Grab Passes for VRChat

Unity base screen space reflection sample