Order Types

pub struct PlaceOrderParams {
    pub price: u64,              // 0 for market; tick-aligned for limit
    pub base_amount: u64,        // size in 9-decimal base (SOL)
    pub direction: Direction,    // Long | Short
    pub post_only: bool,
    pub is_market: bool,
    pub max_slippage_bps: u16,   // market orders only
}

{
  price: 0n,
  baseAmount: 1_000_000_000n,    // 1 SOL
  direction: { __kind: 'Long' },
  postOnly: false,
  isMarket: true,
  maxSlippageBps: 100,            // 1% — revert if avg fill > 1% from quote
}

{
  price: 128_000_000n,            // $128.00
  baseAmount: 2_000_000_000n,
  direction: { __kind: 'Long' },
  postOnly: false,
  isMarket: false,
  maxSlippageBps: 0,              // unused
}

{
  price: 128_000_000n,
  baseAmount: 1_000_000_000n,
  direction: { __kind: 'Long' },
  postOnly: true,
  isMarket: false,
  maxSlippageBps: 0,
}

getCancelOrderInstruction({
  signer,
  userAccount,
  market,
  orderbook,
  params: { orderIndex: 0, direction: { __kind: 'Long' } },   // find via fetch + iter
});

getCancelAllOrdersInstruction({ signer, userAccount, market, orderbook });