u need to change [FeesPayer] => sender and [Primary] => 'false' . this tells the api that there is only one sender and one receiver. check here https://developer.paypal.com/docs/classic/adaptive-payments/integration-guide/APIntro/ for more info try this :
Array
(
[PayRequestFields] => Array
(
[ActionType] => PAY
[CancelURL] => http://example.com/user?tab=financial
[CurrencyCode] => USD
[FeesPayer] => sender
[IPNNotificationURL] =>
[Memo] => example.com Affiliate Payment
[Pin] =>
[PreapprovalKey] => PA-3YM23894VM185730A
[ReturnURL] => http://example.com/paypal/authorizesuccess?d=mail@mydomain.com
[ReverseAllParallelPaymentsOnError] => 1
[SenderEmail] => mail@jexample.com
[TrackingID] => 1398056815
)
[ClientDetailsFields] => Array
(
[CustomerID] => 1
[CustomerType] => Seller
[GeoLocation] =>
[Model] =>
[PartnerName] =>
)
[Receivers] => Array
(
[0] => Array
(
[Amount] => 10000.00
[Email] => usb_1329725429_biz@angelleye.com
[InvoiceID] => 1398056815
[PaymentType] => SERVICE
[PaymentSubType] =>
[Phone] => Array
(
[CountryCode] =>
[PhoneNumber] =>
[Extension] =>
)
[Primary] => 'false'
)
)
[SenderIdentifierFields] => Array
(
[UseCredentials] =>
)
[AccountIdentifierFields] => Array
(
[Email] => mail@example.com
[Phone] => Array
(
[CountryCode] =>
[PhoneNumber] =>
[Extension] =>
)
)
)