Can Your Exchange-Rate API Explain a Customer Dispute? A 2026 Buyer Checklist

Build the dispute evidence workflow

The workflow is intentionally API-based. No native Zendesk, Intercom, payment-processor, spreadsheet, ERP, or MCP integration was verified on the public site. If your support desk receives an evidence packet from a worker, Zapier or n8n step, spreadsheet script, internal admin panel, or AI agent, label it as that workflow. Do not market it as a native integration unless the integration exists.

API examples for support evidence

For a live checkout or quote question, retrieve the conversion evidence and store the response beside the business event.

curl "https://api.currency-exchange.app/v1-convert-currency?from=USD&to=EUR&amount=249.99&skipCache=true&getPerformanceData=true" \
  -H "x-api-key: YOUR_API_KEY"

For a past invoice, refund, or chargeback question, replay the documented historical date used by the business policy.

curl "https://api.currency-exchange.app/v1-get-currency-exchange-rate?from=USD&to=EUR&date=2026-03-31&cacheTimeSeconds=3600" \
  -H "x-api-key: YOUR_API_KEY"

A representative response contains the fields support and finance need to explain.

{
  "exchangeRate": 0.92,
  "rateTime": "2026-03-31T00:00:00.000Z",
  "originalAmount": 249.99,
  "convertedAmount": 229.99,
  "convertedText": "249.99 USD equal to 229.99 EUR",
  "cached": false
}

In production, wrap the call with response-shape validation and rate-limit capture before attaching the bundle to a ticket.

type DisputeInput = {
  from: string;
  to: string;
  amount: number;
  policyDate?: string;
  orderId: string;
};

type ConversionEvidence = {
  exchangeRate: number;
  rateTime: string;
  originalAmount: number;
  convertedAmount: number;
  convertedText?: string;
  cached?: boolean;
};

type SupportEvidence = ConversionEvidence & {
  orderId: string;
  requestedAt: string;
  rateLimit: {
    limit: string | null;
    remaining: string | null;
    reset: string | null;
  };
};

function isConversionEvidence(value: unknown): value is ConversionEvidence {
  if (!value || typeof value !== 'object') return false;
  const record = value as Record<string, unknown>;

  return (
    typeof record.exchangeRate === 'number' &&
    typeof record.rateTime === 'string' &&
    typeof record.originalAmount === 'number' &&
    typeof record.convertedAmount === 'number'
  );
}

export async function buildSupportEvidence(input: DisputeInput): Promise<SupportEvidence> {
  const url = new URL('https://api.currency-exchange.app/v1-convert-currency');
  url.searchParams.set('from', input.from);
  url.searchParams.set('to', input.to);
  url.searchParams.set('amount', String(input.amount));
  url.searchParams.set('skipCache', 'true');
  url.searchParams.set('getPerformanceData', 'true');

  if (input.policyDate) {
    url.searchParams.set('date', input.policyDate);
  }

  const requestedAt = new Date().toISOString();
  const response = await fetch(url, {
    headers: { 'x-api-key': process.env.FX_API_KEY ?? '' },
  });

  const payload: unknown = await response.json();
  if (!isConversionEvidence(payload)) {
    throw new Error('Unexpected conversion response shape');
  }

  return {
    ...payload,
    orderId: input.orderId,
    requestedAt,
    rateLimit: {
      limit: response.headers.get('X-RateLimit-Limit'),
      remaining: response.headers.get('X-RateLimit-Remaining'),
      reset: response.headers.get('X-RateLimit-Reset'),
    },
  };
}

Internal links for the implementation path

• review the documented conversion, rate, currency, key, and usage endpoints
• validate currencies and rate evidence before the exception becomes a ticket
• build refund reconciliation workflows with rate evidence
• separate FX evidence from payment settlement evidence
• monitor freshness, rate limits, and cache behavior

FAQ