Errors

// create-quote
{
  "error": "Minimum for this merchant on this network is 5 EURC.",
  "error_code": "below_merchant_minimum",
  "min_amount": 5,
  "chainId": 84532
}

// create-pool-connect / create-pool-deposit
{ "error": "pool_not_deployed" }

const res = await createQuote(cart);

if (!res.ok) {
  // 429 has no consistent body code — branch on the status first.
  if (res.status === 429) return retryAfter(res.headers.get("Retry-After"));

  const body = await res.json();
  const code = body.error_code ?? body.error;   // the shape differs by endpoint

  switch (code) {
    case "amount_below_minimum":
    case "below_platform_minimum":
    case "below_merchant_minimum":
      return showCheaperChains(body.min_amount);  // recoverable in-flow

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

    case "quote_expired":
      return requote();

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

    default:
      return showGenericFailure();
  }
}