Php 与西方商业分道扬镳

我正在尝试使用splitwise创建一个“支付网关”来创建费用，我使用它来创建费用，我已经创建了下面的代码段来以splitwise生成费用，但是每次我单击place order时，我收到的消息是“请再试一次”

我是api方面的新手，所以我不知道是否有错误，任何帮助都会非常好，谢谢

  public function process_payment( $order_id ) {
        
        global $woocommerce;
        // we need it to get any order detailes
        $order = wc_get_order( $order_id );
        $items = $order->get_items();
        foreach ( $items as $item ) {
            $product_name = $item->get_name();
            $product_id = $item->get_product_id();
            $product_variation_id = $item->get_variation_id();
        }
        /*
        * Array with parameters for API interaction
        */
        $args = array(
            'cost' =>  $order->get_total(),
            'group_id' => 0,
            'description' =>  $product_name,
            'details' =>  'string',
            'repeat_interval'=>  'never',
            'split_equally'=>  true
        );
    
        /*
        * Your API interaction could be built with wp_remote_post()
        */
        $response = wp_remote_post( 'https://secure.splitwise.com/api/v3.0/create_expense', $args );
    
    
        if( !is_wp_error( $response ) ) {
    
            $body = json_decode( $response['body'], true );
    
            // it could be different depending on your payment processor
            if ( $body['response']['responseCode'] == 'APPROVED' ) {
    
                // we received the payment
                $order->payment_complete();
                $order->reduce_order_stock();
    
                // some notes to customer (replace true with false to make it private)
                $order->add_order_note( 'Hey, your order is paid! Thank you!', true );
    
                // Empty cart
                $woocommerce->cart->empty_cart();
    
                // Redirect to the thank you page
                return array(
                    'result' => 'success',
                    'redirect' => $this->get_return_url( $order )
                );
    
            } else {
                wc_add_notice(  'Please try again.', 'error' );
                return;
            }
    
        } else {
            wc_add_notice(  'Connection error.', 'error' );
            return;
        }
    
    }```