Errors

{
  "error": "Amount is below the minimum for this chain",
  "error_code": "amount_below_minimum"
}

const res = await createQuote(cart);

if (!res.ok) {
  const { error_code } = await res.json();

  switch (error_code) {
    case "amount_below_minimum":
      return showConnectRailOnly();          // recoverable in-flow

    case "chain_not_activated":
    case "token_not_enabled":
      return showAlternativeChains();

    case "rate_limited":
      return retryAfter(res.headers.get("Retry-After"));

    case "merchant_not_attested":
    case "pool_not_deployed":
      alertOps(error_code);                  // your config, not the customer's problem
      return showGenericFailure();

    default:
      return showGenericFailure();
  }
}