curl --request GET \
  --url https://api.platform.dakota.xyz/billing/invoices/{year}/{month} \
  --header 'x-api-key: <api-key>'

{
  "invoices": [
    {
      "id": 12345,
      "clientId": "1NFHrqBHb3cTfLVkFSGmHZqdDPi",
      "periodStart": "2025-01-01T00:00:00Z",
      "periodEnd": "2025-02-01T00:00:00Z",
      "volumeUSD": "1250000.50",
      "transactionCount": 150,
      "transferFeeCalculated": "2250.00",
      "monthlyMinimum": "1500.00",
      "baseFeeCharged": "2250.00",
      "achCount": 120,
      "wireCount": 25,
      "sepaCount": 5,
      "achFees": "120.00",
      "wireFees": "625.00",
      "sepaFees": "7.50",
      "totalAmount": "3002.50",
      "stripeInvoiceId": "in_1234567890",
      "createdAt": "2025-01-15T10:30:00Z"
    }
  ]
}