Recipe: End-to-end buyer flow

import { CoreSDK } from "@bosonprotocol/core-sdk"
import { EthersAdapter } from "@bosonprotocol/ethers-sdk"
import { ethers } from "ethers"
 
const CONFIG_ID = "staging-84532-0" as const
const ENV_NAME = "staging" as const
 
async function main() {
  const provider = new ethers.providers.JsonRpcProvider(process.env.RPC_URL)
  const wallet = new ethers.Wallet(process.env.PRIVATE_KEY!, provider)
  const sdk = CoreSDK.fromDefaultConfig({
    web3Lib: new EthersAdapter(provider, wallet),
    envName: ENV_NAME,
    configId: CONFIG_ID,
  })
 
  // 1. Find an offer
  const offers = await sdk.getOffers({
    where: { voided: false, exchangeToken: USDC_ADDRESS },
    orderBy: "price",
    orderDirection: "asc",
    first: 10,
  })
  const pick = offers[0]
  const tokenAddr = pick.exchangeToken.address ?? pick.exchangeToken
  console.log("buying offer", pick.id, "for", pick.price, tokenAddr)
 
  // 2. Approve the ERC-20 (first arg is the TOKEN address, not the offer id)
  await (await sdk.approveExchangeToken(tokenAddr, pick.price)).wait()
 
  // 3. Commit — commitToOffer(offerId, overrides?); buyer is the signer.
  const commitTx = await sdk.commitToOffer(pick.id)
  const receipt = await commitTx.wait()
  await sdk.waitForGraphNodeIndexing(receipt.blockNumber)
  const exchangeId = sdk.getCommittedExchangeIdFromLogs(receipt.logs)
  console.log("committed. exchangeId =", exchangeId)
 
  // 4. Wait for delivery (off-chain, your system)
  await waitForDelivery(exchangeId)
 
  // 5. Redeem
  await (await sdk.redeemVoucher(exchangeId)).wait()
  console.log("redeemed.")
}