证书验证退款接口 返回参数无法转换为数组 ，打印出来的复制到json解析是可以转的
用过的方法 {"alipay_trade_refund_response":{"code":"40002","msg":"Invalid Arguments","sub_code":"isv.invalid-signature","sub_msg":"验签出错，建议检查签名字符串或签名私钥与应用公钥是否匹配，网关生成的验签字符串为：alipay_root_cert_sn=687b59193f3f462dd5336e5abf83c5d8_02941eef3187dddf3d3b83462e1dfcf6&alipay_sdk=alipay-sdk-php-2020-04-15&app_cert_sn=9ed1331764d3b5fe27927589b785253b&app_id=2021001107656338&biz_content={"out_trade_no":"202005201450035375","refund_amount":"0.01","out_request_no":"2020052014500353750000","refund_reason":"1"}&charset=UTF-8&format=json&method=alipay.trade.refund&sign_type=RSA2×tamp=2020-05-21 11:58:41&version=1.0"},"alipay_cert_sn":"4b044bf4f02c22dbe697edb118f5853f","sign":"MZFcmsIHZXyIyFY+T5LBP+hSE6IilHaxKPOOmfFnWgykZdgUhVzBOnW26uv+BLCuKn0Nkq/Mi6KPEm+I+JItIletzvQWkDh6qCKfYLb4Y6Lwf8hn0ySE3GbRG2pd8YyBy0yNteVH7sOQArWyXy7k5bJ/8cpsGQOwYl4E0UV62SiXrAXiqRjbsVcJU9SrMWcCzK58VZKgloSOmQ0SjIHiKeqc6hwje6bed2KdCqyQ+tl8ETkk3YGLZtS3uOreviQrcOcU2wgDKbju7b3FtDYJwBX/dTt8x3pfllJoOQMGXibP2kU5uJ5QqRsECnJz6B9uzbeV6P9v0cOlHMn7bnimqg=="} 返回的参数
这样写结果为NULL
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