Errors

{
  "name": "ERROR_CODE",
  "message": "Human-readable description.",
  "debug_id": "abc123def456",
  "details": [
    {
      "field": "/items/0/unit_amount",
      "issue": "INVALID_FORMAT",
      "description": "The value must be a valid currency amount.",
      "value": "$value",
      "path": "body"
    }
  ],
  "links": [
    {
      "rel": "information_link",
      "href": "https://developer.paypal.com/docs/api/invoicing/#errors"
    }
  ]
}

{
  "name": "INVALID_REQUEST",
  "message": "The merchant account specified must be in good standing with PayPal.",
  "debug_id": "xyz789abc",
  "details": [
    {
      "field": "/invoicer",
      "issue": "INVALID_ACCOUNT",
      "description": "The specified merchant account does not exist or is not in good standing."
    }
  ]
}

{
    "name": "UNPROCESSABLE_ENTITY",
    "message": "The requested action could not be performed, semantically incorrect, or failed business validation.",
    "debug_id": "2493c71e2152b",
    "details": [
        {
            "field": "invoiceId",
            "value": "INV2-5GE6-2KVL-XPUN-G5LQ",
            "location": "path",
            "issue": "INVOICE_ALREADY_SENT",
            "description": "The invoice is already sent."
        }
    ],
    "links": [
        {
            "href": "https://developer.paypal.com/docs/api/invoicing/#errors",
            "method": "GET"
        }
    ]
}

async function makeRequestWithRetry(url, options, maxRetries = 3) {
  for (let attempt = 1; attempt <= maxRetries; attempt++) {
    try {
      const response = await fetch(url, options);
      if (response.ok) {
        return response;
      }
      if (response.status === 429 || response.status >= 500) {
        const delayMs = Math.pow(2, attempt - 1) * 1000 + Math.random() * 1000;
        console.log(`Retrying in ${delayMs}ms...`);
        await new Promise(resolve => setTimeout(resolve, delayMs));
        continue;
      }
      // Non-retryable error
      throw new Error(`HTTP ${response.status}: ${response.statusText}`);
    } catch (error) {
      if (attempt === maxRetries) throw error;
    }
  }
}