Function rest_reward_state_service_get_reward_account_proof 

async fn rest_reward_state_service_get_reward_account_proof<S>(
    __arg0: State<Arc<S>>,
    headers: HeaderMap,
    __arg2: Query<GetRewardAccountProofRequest>,
) -> Result<Json<RewardAccountProofResponse>, RestError>
where
    S: RewardStateService + Send + Sync + 'static,

GetRewardAccountProof - JSON endpoint.

GET /v2/merklized-state/reward/proof