First Refund Order request and response log

2023-10-20T09:12:08+00:00 INFO Action: Refund Order
2023-10-20T09:12:08+00:00 INFO Request URL: https://api-m.sandbox.paypal.com/v2/payments/captures/2YY62621FK901853S/refund
2023-10-20T09:12:08+00:00 INFO Request Body: Array
(
    [note_to_payer] => Refund
    [amount] => Array
        (
            [value] => 18.00
            [currency_code] => USD
        )

)

2023-10-20T09:12:08+00:00 INFO Response Headers: Array
(
    [paypal-debug-id] => e05d09cb4176a
)

2023-10-20T09:12:08+00:00 INFO Response Body: Array
(
    [name] => UNPROCESSABLE_ENTITY
    [message] => The requested action could not be performed, semantically incorrect, or failed business validation.
    [debug_id] => e05d09cb4176a
    [details] => Array
        (
            [0] => Array
                (
                    [issue] => PLATFORM_FEE_EXCEEDED
                    [description] => Platform fee amount specified exceeds the amount that is available for refund. You can only refund up to the available platform fee amount. This error is also returned when no platform_fee was specified or was zero when the payment was captured.
                )

        )

    [links] => Array
        (
            [0] => Array
                (
                    [href] => https://developer.paypal.com/docs/api/payments/v2/#error-PLATFORM_FEE_EXCEEDED
                    [rel] => information_link
                )

        )

)