Greške i error kodovi

{
  "error": {
    "code": "invalid_oib",
    "message": "OIB '1234567890' nije valjan. Kontrolna znamenka ne odgovara.",
    "param": "buyer.oib",
    "doc_url": "https://fiskalapi.hr/docs/reference/greske#invalid_oib"
  },
  "request_id": "req_abc123xyz789"
}

import FiskalAPI, { FiskalAPIError } from '@fiskalapi/node';

const fiskal = new FiskalAPI(process.env.FISKALAPI_KEY);

try {
  const invoice = await fiskal.invoices.fiscalize({ ... });
} catch (error) {
  if (error instanceof FiskalAPIError) {
    switch (error.code) {
      case 'invalid_oib':
        console.error('Neispravan OIB:', error.param);
        break;
      case 'duplicate_invoice':
        console.error('Račun već postoji');
        break;
      case 'porezna_unavailable':
        console.error('Porezna nedostupna, pokušaj kasnije');
        // Implementiraj retry logiku
        break;
      case 'rate_limit_exceeded':
        const retryAfter = error.headers['retry-after'];
        console.error(`Rate limit, pokušaj za ${retryAfter}s`);
        break;
      default:
        console.error('Nepoznata greška:', error.message);
    }
    
    // Za support ticket
    console.error('Request ID:', error.requestId);
  }
}

async function fiscalizeWithRetry(data, maxRetries = 3) {
  for (let attempt = 0; attempt < maxRetries; attempt++) {
    try {
      return await fiskal.invoices.fiscalize(data);
    } catch (error) {
      const isRetryable = 
        error.code === 'porezna_unavailable' ||
        error.code === 'porezna_timeout' ||
        error.statusCode >= 500;
      
      if (!isRetryable || attempt === maxRetries - 1) {
        throw error;
      }
      
      // Exponential backoff: 1s, 2s, 4s
      const delay = Math.pow(2, attempt) * 1000;
      await new Promise(r => setTimeout(r, delay));
    }
  }
}