const subaccountIndex = 0;

const [portfolioPDA] = PublicKey.findProgramAddressSync(
  [
    Buffer.from("portfolio"),
    user.publicKey.toBuffer(),
    Buffer.from([subaccountIndex & 0xff, (subaccountIndex >> 8) & 0xff]),
  ],
  program.programId
);

await program.methods
  .initializePortfolio(subaccountIndex, PublicKey.default)
  .accounts({
    portfolio: portfolioPDA,
    user: user.publicKey,
    relayer: user.publicKey, // or a gasless relayer signer
    systemProgram: SystemProgram.programId,
  })
  .signers([user])
  .rpc();

const [seatPDA] = PublicKey.findProgramAddressSync(
  [Buffer.from("seat"), marketV2PDA.toBuffer(), user.publicKey.toBuffer()],
  program.programId
);

await program.methods
  .claimSeat()
  .accounts({
    seat: seatPDA,
    market: marketV2PDA,
    user: user.publicKey,
  })
  .signers([user])
  .rpc();

import * as anchor from "@coral-xyz/anchor";
import { PublicKey, SystemProgram } from "@solana/web3.js";

// PDAs from steps 1–2 above: portfolioPDA, seatPDA

// Place order — side 1 = bid, size/price in program-native units
await program.methods
  .placeOrderV2(
    1,                        // bid
    new anchor.BN(10_000),    // size (check market lot_size)
    new anchor.BN(50_000)     // price (check market tick_size)
  )
  .accounts({
    market: marketV2PDA,
    bids: bidsPDA,
    asks: asksPDA,
    portfolio: portfolioPDA,
    seat: seatPDA,
    user: user.publicKey,
    relayer: user.publicKey,
    jitMaker: null,
    jitPortfolio: null,
  })
  .signers([user])
  .rpc();