curl 'https://api.sandbox.uqpay.org/api/v1/balances/retrieve/SGD' \
-H 'x-auth-token: Bearer 0e043e2ec6898b3220a0921466d7c203' \
-H 'x-client-id: Up1HIsjiETPXLy7gON9PMG'

{
    "code": 200,
    "message": "Success",
    "data": {
        "available_balance": "742",
        "balance_id": "b8241d83-b849-49c5-ac20-c2c311953577",
        "currency": "SGD"
    }
}