Crear payin con código QR

curl --location --request POST 'https://stablecoin-api.sandbox.getmeru.com/v1/payins/qr-code' \
--header 'Content-Type: application/json' \
--header 'api-key: <api-key>' \
--data-raw '{
    "externalId": "EXT-10001",
    "orderId": "ORD-12345",
    "amount": 99.99,
    "taxAmount": 8.99,
    "currency": "USD",
    "expireAt": "2026-04-17T12:46:44.310Z",
    "onBehalfOf": "cus_123"
}'

const response = await fetch('https://stablecoin-api.sandbox.getmeru.com/v1/payins/qr-code', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'api-key': '<api-key>'
  },
  body: JSON.stringify({
    externalId: 'EXT-10001',
    orderId: 'ORD-12345',
    amount: 99.99,
    taxAmount: 8.99,
    currency: 'USD',
    expireAt: '2026-04-17T12:46:44.310Z',
    onBehalfOf: 'cus_123'
  })
});

const data = await response.json();

{
  "success": true,
  "paymentId": "pay_3ddd0e5b-6276-4b48-b756-c1fcc9a2efd1",
  "qrCode": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAA...",
  "expireAt": "2026-04-17T12:46:44.310Z"
}

{
  "success": false,
  "error": "externalId was already used"
}