Not Giving RP

Hi,
I don't know anything about ShoppyStock but to make RustRewards give you RP for killing npcs, you just have to make sure ServerRewards is installed, and chosen as the currency in RustRewards config,
and then that the reward value for Kills>NPCS (whatever npc type you want) is set to above zero.

RustRewards lists lists all the vanilla npc types by their location, like OilRig, BandTown, etc,
plus BotReSpawn and ZombieHorde.

Npcs spawned by other plugins might fall under 'Scientist' but that really depends on the plugin.

If you have that all set up and you're not getting rewards, make sure you don't have a multiplier in play set to 0, as that would nullify any potential reward.
Any multipliers you want disabled/off should be set to 1.