curl --request GET \
  --url https://api.lightspark.com/grid/2025-10-13/customers/internal-accounts \
  --header 'Authorization: Basic <encoded-value>'

{
  "data": [
    {
      "id": "InternalAccount:12dcbd6-dced-4ec4-b756-3c3a9ea3d123",
      "customerId": "Customer:019542f5-b3e7-1d02-0000-000000000001",
      "balance": {
        "amount": 12550,
        "currency": {
          "code": "USD",
          "name": "United States Dollar",
          "symbol": "$",
          "decimals": 2
        }
      },
      "fundingPaymentInstructions": [
        {
          "reference": "UMA-Q12345-REF",
          "instructionsNotes": "Please ensure the reference code is included in the payment memo/description field",
          "bankAccountInfo": {
            "accountType": "CLABE",
            "clabeNumber": "123456789012345678",
            "bankName": "BBVA Mexico"
          }
        }
      ],
      "createdAt": "2025-10-03T12:30:00Z",
      "updatedAt": "2025-10-03T12:30:00Z"
    }
  ],
  "hasMore": true,
  "nextCursor": "<string>",
  "totalCount": 123
}