RemitFlex Error Codes, HTTP Statuses, and Retry Logic

async function createPaymentWithRetry(payload, idempotencyKey, maxAttempts = 3) {
  const RETRYABLE_STATUSES = [500, 503];
  let delay = 1000; // start at 1 second

  for (let attempt = 1; attempt <= maxAttempts; attempt++) {
    const response = await fetch("https://api.remitflex.com/v1/payments", {
      method: "POST",
      headers: {
        "Authorization": `Bearer ${process.env.REMITFLEX_API_KEY}`,
        "Idempotency-Key": idempotencyKey,
        "Content-Type": "application/json",
      },
      body: JSON.stringify(payload),
    });

    if (response.ok) return response.json();

    const error = await response.json();

    if (!RETRYABLE_STATUSES.includes(response.status)) {
      // Permanent error — surface immediately, do not retry
      throw new Error(`Non-retryable error: ${error.error.code}`);
    }

    if (attempt === maxAttempts) {
      throw new Error(`Max retries exceeded. Last error: ${error.error.code}`);
    }

    console.warn(`Attempt ${attempt} failed (${error.error.code}). Retrying in ${delay}ms...`);
    await new Promise((resolve) => setTimeout(resolve, delay));
    delay *= 2; // exponential backoff
  }
}