curl \
  --request GET \
  --url "https://api.breeze.blue/v1/balance" \
  --header "xi-api-key: $BREEZE_API_KEY"

{
  "balance": 123,
  "balance_millicredits": 123,
  "topups": [
    {
      "topup_id": "<string>",
      "amount": 123,
      "status": "<string>",
      "created_at": "<string>"
    }
  ]
}