curl --request GET \
  --url https://payments.oaknetwork.org/api/v1/customers/{customer_id}/balances \
  --header 'Authorization: Bearer <token>'

{
  "msg": "<string>",
  "data": {
    "as_of": "2023-11-07T05:31:56Z",
    "filters": {
      "customer_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "provider": "<string>",
      "role": "<string>"
    },
    "balances": [
      {
        "provider": "<string>",
        "role": "<string>",
        "available_balance": 123,
        "pending_balance": 123,
        "currency": "<string>"
      }
    ]
  }
}