USER=*****&PWD=*****&VERSION=119.0&BUTTONSOURCE=AngellEYE_PHPClass&SIGNATURE=*****&METHOD=DoExpressCheckoutPayment&TOKEN=123423&PAYERID=abc&PAYMENTREQUEST_0_AMT=100.00&PAYMENTREQUEST_0_ITEMAMT=100.00&L_PAYMENTREQUEST_0_NAME0=Test Widget&L_PAYMENTREQUEST_0_AMT0=50.00&L_PAYMENTREQUEST_0_NUMBER0=abc-123&L_PAYMENTREQUEST_0_QTY0=2&L_PAYMENTREQUEST_0_REDEEMEDOFFERNAME0=SomeOfferName&L_PAYMENTREQUEST_0_REDEEMEDOFFERDESCRIPTION0=SomeOfferDescription&L_PAYMENTREQUEST_0_REDEEMEDOFFERAMOUNT0=5.00&L_PAYMENTREQUEST_0_REDEEMEDOFFERTYPE0=LOYALTY_CARD&L_PAYMENTREQUEST_0_REDEEMEDOFFERID0=123-ID&L_PAYMENTREQUEST_0_REDEEMEDOFFERNAME1=SomeOtherOfferName&L_PAYMENTREQUEST_0_REDEEMEDOFFERDESCRIPTION1=SomeOtherOfferDescription&L_PAYMENTREQUEST_0_REDEEMEDOFFERAMOUNT1=1.00&L_PAYMENTREQUEST_0_REDEEMEDOFFERTYPE1=LOYALTY_CARD&L_PAYMENTREQUEST_0_REDEEMEDOFFERID1=1232-ID&L_PAYMENTREQUEST_0_MERCHANTDATAKEY0=CustomKey&L_PAYMENTREQUEST_0_MERCHANTDATAVALUE0=CustomValue&L_PAYMENTREQUEST_0_MERCHANTDATAKEY1=CustomKey2&L_PAYMENTREQUEST_0_MERCHANTDATAVALUE1=CustomValue2&L_PAYMENTREQUEST_0_MERCHANTDATAKEY2=CustomKey3&L_PAYMENTREQUEST_0_MERCHANTDATAVALUE2=CustomValue3

Array
(
    [USER] => *****
    [PWD] => *****
    [VERSION] => 119.0
    [BUTTONSOURCE] => AngellEYE_PHPClass
    [SIGNATURE] => *****
    [METHOD] => DoExpressCheckoutPayment
    [TOKEN] => 123423
    [PAYERID] => abc
    [PAYMENTREQUEST_0_AMT] => 100.00
    [PAYMENTREQUEST_0_ITEMAMT] => 100.00
    [L_PAYMENTREQUEST_0_NAME0] => Test Widget
    [L_PAYMENTREQUEST_0_AMT0] => 50.00
    [L_PAYMENTREQUEST_0_NUMBER0] => abc-123
    [L_PAYMENTREQUEST_0_QTY0] => 2
    [L_PAYMENTREQUEST_0_REDEEMEDOFFERNAME0] => SomeOfferName
    [L_PAYMENTREQUEST_0_REDEEMEDOFFERDESCRIPTION0] => SomeOfferDescription
    [L_PAYMENTREQUEST_0_REDEEMEDOFFERAMOUNT0] => 5.00
    [L_PAYMENTREQUEST_0_REDEEMEDOFFERTYPE0] => LOYALTY_CARD
    [L_PAYMENTREQUEST_0_REDEEMEDOFFERID0] => 123-ID
    [L_PAYMENTREQUEST_0_REDEEMEDOFFERNAME1] => SomeOtherOfferName
    [L_PAYMENTREQUEST_0_REDEEMEDOFFERDESCRIPTION1] => SomeOtherOfferDescription
    [L_PAYMENTREQUEST_0_REDEEMEDOFFERAMOUNT1] => 1.00
    [L_PAYMENTREQUEST_0_REDEEMEDOFFERTYPE1] => LOYALTY_CARD
    [L_PAYMENTREQUEST_0_REDEEMEDOFFERID1] => 1232-ID
    [L_PAYMENTREQUEST_0_MERCHANTDATAKEY0] => CustomKey
    [L_PAYMENTREQUEST_0_MERCHANTDATAVALUE0] => CustomValue
    [L_PAYMENTREQUEST_0_MERCHANTDATAKEY1] => CustomKey2
    [L_PAYMENTREQUEST_0_MERCHANTDATAVALUE1] => CustomValue2
    [L_PAYMENTREQUEST_0_MERCHANTDATAKEY2] => CustomKey3
    [L_PAYMENTREQUEST_0_MERCHANTDATAVALUE2] => CustomValue3
)