Paypal实现循环扣款（订阅）功能

 public function onPay($request)
 {
 $apiContext = $this->getApiContext();
 if ($request->has('success') && $request->success == 'true') {
 $token = $request->token;
 $agreement = new \PayPal\Api\Agreement();
 try {
 $agreement->execute($token, $apiContext);
 } catch(\Exception $e) {
 return ull;
 return $agreement;
 }
 return null;
 }

 /** 获取交易记录
 * @param $id subscription payment_id
 * @warning 总是获取该subscription的所有记录
 */
 public function transactions($id)
 {
 $apiContext = $this->getApiContext();
 $params = ['start_date' => date('Y-m-d', strtotime('-15 years')), 'end_date' => date('Y-m-d', strtotime('+5 days'))];
 try {
 $result = Agreement::searchTransactions($id, $params, $apiContext);
 } catch(\Exception $e) {
 Log::error("get transactions failed" . $e->getMessage());
 return null;
 }
 return $result->getAgreementTransactionList() ;
 }