Pay partner invoice (PayPal payment)

Request

<?php

require ('PATH_TO_AUTH');  // Authentication example: https://knowledgecenter.avangate.com/Integration/Channel_Manager_API/JSON-RPC/02Authentication
require ('PATH_TO_setPartner'); // setPartner example: https://knowledgecenter.avangate.com/Integration/Channel_Manager_API/JSON-RPC/06Reference/Partner/00Set_partner
require ('PATH_TO_setProforma'); // setProforma example: https://knowledgecenter.avangate.com/Integration/Channel_Manager_API/JSON-RPC/06Reference/14Billing/00Capture_card_payment/00Set_partner_invoice
require ('PATH_TO_setPaymentDetails'); // setPaymentDetails example: https://knowledgecenter.avangate.com/Integration/Channel_Manager_API/JSON-RPC/06Reference/14Billing/02Capture_PayPal_payment/Set_partner_invoice_payment_details

$jsonRpcRequest = array (
  'jsonrpc' => '2.0',
  'id' => $i++,
  'method' => 'payProforma',
  'params' => array($sessionID)
);
var_dump (callRPC((Object)$jsonRpcRequest,$host));