USER=*****&PWD=*****&VERSION=119.0&BUTTONSOURCE=AngellEYE_PHPClass&SIGNATURE=*****&METHOD=RefundTransaction&TRANSACTIONID=ABC&REFUNDTYPE=Full&MERCHANTDATA0KEY=Key1&MERCHANTDATA0VALUE=Value1&MERCHANTDATA1KEY=Key2&MERCHANTDATA1VALUE=Value2

Array
(
    [USER] => *****
    [PWD] => *****
    [VERSION] => 119.0
    [BUTTONSOURCE] => AngellEYE_PHPClass
    [SIGNATURE] => *****
    [METHOD] => RefundTransaction
    [TRANSACTIONID] => ABC
    [REFUNDTYPE] => Full
    [MERCHANTDATA0KEY] => Key1
    [MERCHANTDATA0VALUE] => Value1
    [MERCHANTDATA1KEY] => Key2
    [MERCHANTDATA1VALUE] => Value2
)