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You have to register the outgoing RPC callback, then read the structure as it would happen in lua/sf/rakhook

//callback

bool __stdcall RakClientRPCHook(SAMP::CallBacks::HookedStructs::s tRakClientRPC *params) {

return true;

}

//callback register

SAMP::CallBacks:CallBackRegister->RegisterRakClientCallback(RakClientRPCHook);