How did I deal with… programming interaction using an interface in C++ for Unreal Engine.

How did I deal with… programming interaction using an interface in C++ for Unreal Engine.
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The goal of this workflow development is to provide the player with an efficient interaction, using as few resources as possible, picking up collectibles inside the level. These are the steps I'm taking to plan, test and implement my interaction:
• Picking up item
• One page design document
• UI prototype
• Storyboard
• C++ logic schematics
• Pickup counter
• Active interface check out
• One item left
• All pickups collected
• Interact function
Here you can see the block out of your player character in front of a changing color collectible, from yellow to orange, indicating that it's ready for pickup.