Types don't match reality

[matshadow]

Hey team,

I have noticed that a payout's amount using cURL is of type integer (in line with your Java SDK), yet for some reason Node version of the SDK has it as string

    "payouts": {
        "amount": 50000,
        "deducted_fees": 0,
        "currency": "GBP",
        .....
    }
    ```