调起支付宝失败

alipay_sdk=alipay-sdk-php-20200415&  
                app_id=2021002128654948&  
                biz_content=%7B%22subject%22%3A%22%5Cu5728%5Cu7ebf%5Cu5145%5Cu503c200%5Cu5143%22%2C%22out_trade_no%22%3A%22PN2021022417248198323132%22%2C%22timeout_express%22%3A%2290m%22%2C%22total_amount%22%3A%22200.00%22%7D&  
                charset=UTF-8&  
                format=json&  
                method=alipay.trade.app.pay&  
                notify_url=http%3A%2F%2Fyouban.oephp.com%2Fnotify%2Fwap_alipay.php&  
                sign_type=RSA2&  
                timestamp=2021-02-24+17%3A24%3A00&  
                version=1.0&  
                sign=cq11L6BM8mF0%2B5%2FYZoxHJ1dx7Ev4oSxw2Fq80MxVOzvODj3llq8ukdwMX3OU%2FzBm3iHlTmk8QiJ9lLPYMO%2F96UNGgha%2Ferji372S5qJFTa9hbc195eS6Mw4LYPldf%2FKcazM7Xl12K68DwSx2jNctnSqAGSu9TunNhfR1ilyCT3gD4Xh9tlkLz2uED7UTS6CoEpCImBXLHM%2F4cn0s6LlDRLF0HJXsT9YX7bvvyzQfgkIan8pgdlFQ1dkFMRQMRO5HbA%2BtOGRIdfeebhBUJdcilVQq1bHy3MJXGxm2yhM8lDEnF1%2BJ%2BounGOyW6uTN1LBrS67OEYx9vGLdH%2BPYr4Cinw%3D%3D

提示：商家订单参数异常，请重新发起支付
有没有大神帮忙看一下参数有什么问题，拜托拜托!