I am sending the request like below and getting error in response. Please help me what I did wrong. Thanks .
My Request :- 
requestEnvelope.errorLanguage=en_US
&requestEnvelope.detailLevel=ReturnAll
&payKey=AP-0VR709562K128704J
&receiverList.receiver(0).email=buyer@abc.com
&receiverList.receiver(0).amount=14.00
¤cyCode=GBP
My Response :- 
Array
(
    [responseEnvelope.timestamp] => 2017-02-24T05:50:55.589-08:00
    [responseEnvelope.ack] => Failure
    [responseEnvelope.correlationId] => 66bf1bad1aa91
    [responseEnvelope.build] => 30051544
    [error(0).errorId] => 589037
    [error(0).domain] => PLATFORM
    [error(0).subdomain] => Application
    [error(0).severity] => Error
    [error(0).category] => Application
    [error(0).message] => The refund's receiver buyer@abc.com wasn't part of the payment request
    [error(0).parameter(0)] => buyer@abc.com
)