Function update_snapshot 

pub fn update_snapshot(
    oracle: Pubkey,
    epoch: u64,
    seal_merkle_root: [u8; 32],
    payment_merkle_root: [u8; 32],
    epoch_hash: [u8; 32],
    customer_reward_pool: u64,
    merchant_reward_pool: u64,
    customer_participants: u32,
    merchant_participants: u32,
    total_customer_payments: u32,
    total_merchant_payments: u32,
) -> Instruction

Builds an update snapshot instruction.