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一、准备工作
登录 https://www.paypal.com/ 注册一个主账号（选择个人账号、企业账后都可）
申请完成后登录https://developer.paypal.com/ 在后台右侧菜地点击“Accounts”，可以看到系统自动给分配的两个沙箱环境的账号。类型为Personal是个人账号、类型为Business是商家账号。点进去可以看到密码
开启PDT设置同步回调地址（这步拿到at_token return回调使用）
用系统分配的卖家账号登录沙箱地址https://www.sandbox.paypal.com/

二： 调用接口，获取token,创建订单，生成支付链接，然后捕获订单确认付款，处理回调事件。

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三：修改回调事件在选择的应用，点击进去后可以修改增加，捕获订单接口在回调的时候调用

参考链接： 【支付】PayPal支付通道 Java对接 （下单 付款 确认 退款 查询 回调）_java对接paypal-CSDN博客

php PayPal 支付/回调 - 加菲猫and大白 - 博客园

/*** 统一下单接口* @param $order* @param string $trade_type* @return array*/
function create_order_bak()
{$domain = $this->request->domain();$order['order_no'] = 10191;$arr = ['purchase_units' => [['custom_id' => 1,'reference_id' => $order['order_no'],//订单ID'amount' => ['currency_code' => 'USD','value' => 1]]],'intent' => 'CAPTURE','payment_source' => ['paypal' => ['experience_context' => ['payment_method_preference' => 'IMMEDIATE_PAYMENT_REQUIRED','payment_method_selected' => 'PAYPAL','brand_name' => 'TEST','landing_page' => 'GUEST_CHECKOUT',//直接付款'user_action' => 'PAY_NOW','return_url' => 'https://1688order.com',//付款后回调地址'cancel_url' => 'https://1688order.com'//取消付款后回调地址]]]];$result = $this->post(self::ONLINE_USEEPAY_SANDBOX_ENDPOINT.'/v2/checkout/orders',['Content-Type: application/json','Authorization: Bearer '.$this->getPaypalToken(),'PayPal-Request-Id: '.'TEST-'.$order['order_no']],json_encode($arr));// Log::write('创建订单返回信息：'.var_export($result, true));if(isset($result['id'])){return array('code' => 1, 'msg' => '创建订单成功', 'data' => $result);}else{//   return array('code' => 0, 'data' => $result['message']);}}/*** id 是下单的时候生成的订单的ID* paypal 回调后 捕获订单付款*/
function paypalOrderCapture($id){$result = $this->post(self::ONLINE_USEEPAY_SANDBOX_ENDPOINT.'/v2/checkout/orders/'.$id.'/capture',['Content-Type: application/json','Authorization: Bearer '.$this->getPaypalToken(),'PayPal-Request-Id: '.'TEST-'.$id]);return $result['status'] == 'COMPLETED' ? $result : false;}

/*** 获取token，一般返回来的access token有效时是9个小时**/
function getPaypalToken(){$paypal_token_config = cache("paypal-token-new");$end_time = time();if($paypal_token_config){$result = $paypal_token_config;$results = json_decode($result, true);$end_time = $results['time'] + $results['expires_in'];}if($end_time - time() < 1800){ //更新access token$result = $this->post(self::ONLINE_USEEPAY_SANDBOX_ENDPOINT.'/v1/oauth2/token',['Content-Type: application/x-www-form-urlencoded','Authorization:Basic '.base64_encode(self::ONLINE_CLEINTID.":".self::ONLINE_CLIENTSECRET)],http_build_query(['grant_type' => 'client_credentials']));if(isset($result['app_id'])){$result['time'] = time();cache("paypal-token-new",json_encode($result),3600);}}return isset($results['access_token']) ? $results['access_token'] : false;
}

/*** 发起POST请求*/
public function post($url, $headers, $request = array())
{$header_res = [];$curl = curl_init($url);curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "POST");curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);curl_setopt($curl, CURLOPT_POST, 1);curl_setopt($curl, CURLOPT_POSTFIELDS, $request);curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);curl_setopt($curl, CURLOPT_HEADERFUNCTION,function ($curl, $header) use (&$header_res) {$len = strlen($header);$header = explode(':', $header, 2);if (count($header) < 2) // ignore invalid headersreturn $len;$header_res[strtolower(trim($header[0]))][] = trim($header[1]);return $len;});$response_data = curl_exec($curl);curl_close($curl);$result = json_decode($response_data, true);return $result;
}

//回调地址
public function notify_order(){Log::write('paypal 支付进来了');$payload = @file_get_contents('php://input');// 调用 record() 方法记录日志// Log::write('content'.var_export($payload, true));$ret = json_decode($payload, true);Log::write('数组格式返回:'.var_export($ret, true));// Log::write('id'.var_export($ret['resource']['id'], true));// Log::write('status'.var_export($ret['resource']['status'], true));$order_id = $ret['resource']['id'];$result = $this->paypalOrderCapture($order_id);Log::write('确认付款后返回结果:'.var_export($result, true));$captureId = $result['purchase_units'][0]['payments']['captures'][0]['id'];//捕获ID，在退款的时候使用Log::write('确认支付后的支付状态是：'.var_export($result['status'], true));Log::write('捕获ID是:'.var_export($captureId, true));$web_order_id = $result['purchase_units'][0]['reference_id'];//网站下单的订单IDLog::write('网站下单的订单ID:'.var_export($web_order_id, true));$buy_type = $result['purchase_units'][0]['payments']['captures'][0]['custom_id'];//下单类型Log::write('网站下单类型:'.var_export($buy_type, true));//如果确认支付成功if ($result['status'] == 'COMPLETED'){//调用修改订单状态后续逻辑$res =  PayNotifyLogic::handle('order_buy', $web_order_id, ['buy_type'=>$buy_type,'payment_intent_id'=>$captureId]);if ($res) {$this->success('success', url('/pc/user/order/detail', ['id' => $order_id]));}}else{Log::write('确认付款失败返回结果:'.var_export($result, true));}}