Alipay Sign Verify FAILED

错误：Alipay Sign Verify FAILED ，搞不懂为什么是GBK

    Log::info('Received Alipay Request', $data);

    if (Support::verifySign($data)) {
        return new Collection($data);
    }

    Log::warning('Alipay Sign Verify FAILED', $data);

    throw new InvalidSignException('Alipay Sign Verify FAILED', $data);

公钥私钥全都对了一次，确保不是填错的问题了，就是老是这个问题，我都对了好多次了。
日志是：
2018-10-17 01:34:16 > INFO > Starting To Pay An Alipay Web/Wap Order ["https://openapi.alipaydev.com/gateway.do",{"app_id":"2016082000296760","method":"alipay.trade.page.pay","format":"JSON","charset":"utf-8","sign_type":"RSA2","version":"1.0","return_url":"http://larshop.demondun.xin/payment/alipay/return","notify_url":"http://larshop.demondun.xin/payment/alipay/notify","timestamp":"2018-10-17 01:34:16","sign":"ez/kVJDVZBIwlx/fgiZhaWsA7JvrDiN3CqXs5wAekOnjU8Ksh/yXDK0N4FebJUapjtGNhkQkok0eklg+VK2z/Exu1ZZ424Hhmv5JZYyZ6U2LN1QK4r17mNPR+Tx6v8GWfDzYDk/mkb7syiHY3kbEGkZrdv/qqGKLP+VOGMe6mZTFsSsk6hVeSqk1yBzzbNJdj2aCqcJks9bT+vMEFdqJe430wppU4kldYeSVdjBI5hQ/Y9gR6gWlP5v8O9+MA6thaljLQCUoPb8jRpIT2bQ4rMZO1c5Xan/8gQUVN2qHDXZV9SzAxdWMbyStcdVVL+9Pbd5qlTtUtBLQwgaLWqOSjA==","biz_content":"{\"out_trade_no\":\"20181017013413869527\",\"total_amount\":\"1448.00\",\"subject\":\"\u652f\u4ed8 Laravel Shop \u7684\u8ba2\u5355\uff1a20181017013413869527\",\"product_code\":\"FAST_INSTANT_TRADE_PAY\"}"}]

2018-10-17 01:34:57 > INFO > Received Alipay Request {"_url":"/payment/alipay/return","charset":"GBK","out_trade_no":"20181017013413869527","method":"alipay.trade.page.pay.return","total_amount":"1448.00","sign":"OzxLrivzwjTCRd9Tl2VfCRO3iSdOvGIoSWR2vpspv6UybUwQcGNLPCZyg6bHQQklbM4wt66HBJioglDIWf7GP7qvIo/PFwAoaTxnne5QkYClVkq2t+HpTua+JxwtvQQfv4jzWimPbv+NudKYTiI6MIOcrPY+gSzKJKUl8ReTMYzIVFd53aBLyAQl4FX40QCV21Z2B1gx1I4MD98FAxrQhcta2thtHawj97PM0CWAzCpZms5eTEsh025yMV3v1DIgPGoEZ6W4V3UeYxyWScGzhEAb8/3fdjQfQY9UHy2A1mIDnzN5Nj7bjzXnbfdBWGSjlhmOKupSyvXJ8ztnwOleIg==","trade_no":"2018101722001494430500444645","auth_app_id":"2016082000296760","version":"1.0","app_id":"2016082000296760","sign_type":"RSA2","seller_id":"2088102172258602","timestamp":"2018-10-17 09:34:54"}

2018-10-17 01:34:57 > DEBUG > Alipay Generate Sign Content Before Trim [{"_url":"/payment/alipay/return","app_id":"2016082000296760","auth_app_id":"2016082000296760","charset":"GBK","method":"alipay.trade.page.pay.return","out_trade_no":"20181017013413869527","seller_id":"2088102172258602","sign":"OzxLrivzwjTCRd9Tl2VfCRO3iSdOvGIoSWR2vpspv6UybUwQcGNLPCZyg6bHQQklbM4wt66HBJioglDIWf7GP7qvIo/PFwAoaTxnne5QkYClVkq2t+HpTua+JxwtvQQfv4jzWimPbv+NudKYTiI6MIOcrPY+gSzKJKUl8ReTMYzIVFd53aBLyAQl4FX40QCV21Z2B1gx1I4MD98FAxrQhcta2thtHawj97PM0CWAzCpZms5eTEsh025yMV3v1DIgPGoEZ6W4V3UeYxyWScGzhEAb8/3fdjQfQY9UHy2A1mIDnzN5Nj7bjzXnbfdBWGSjlhmOKupSyvXJ8ztnwOleIg==","sign_type":"RSA2","timestamp":"2018-10-17 09:34:54","total_amount":"1448.00","trade_no":"2018101722001494430500444645","version":"1.0"},"_url=/payment/alipay/return&app_id=2016082000296760&auth_app_id=2016082000296760&charset=GBK&method=alipay.trade.page.pay.return&out_trade_no=20181017013413869527&seller_id=2088102172258602&timestamp=2018-10-17 09:34:54&total_amount=1448.00&trade_no=2018101722001494430500444645&version=1.0&"]

2018-10-17 01:34:57 > WARNING > Alipay Sign Verify FAILED {"_url":"/payment/alipay/return","charset":"GBK","out_trade_no":"20181017013413869527","method":"alipay.trade.page.pay.return","total_amount":"1448.00","sign":"OzxLrivzwjTCRd9Tl2VfCRO3iSdOvGIoSWR2vpspv6UybUwQcGNLPCZyg6bHQQklbM4wt66HBJioglDIWf7GP7qvIo/PFwAoaTxnne5QkYClVkq2t+HpTua+JxwtvQQfv4jzWimPbv+NudKYTiI6MIOcrPY+gSzKJKUl8ReTMYzIVFd53aBLyAQl4FX40QCV21Z2B1gx1I4MD98FAxrQhcta2thtHawj97PM0CWAzCpZms5eTEsh025yMV3v1DIgPGoEZ6W4V3UeYxyWScGzhEAb8/3fdjQfQY9UHy2A1mIDnzN5Nj7bjzXnbfdBWGSjlhmOKupSyvXJ8ztnwOleIg==","trade_no":"2018101722001494430500444645","auth_app_id":"2016082000296760","version":"1.0","app_id":"2016082000296760","sign_type":"RSA2","seller_id":"2088102172258602","timestamp":"2018-10-17 09:34:54"}