Hello, $request->getQueryParams() value is null

app env
slim v3.8.1
php 7.1.8 nts

GET /payment/tianfubao/notify?cipher_data=S%2FTqbQYcG36j0%2FeEX2%2FdVdTVkwuViUpf12%2BpDexOBfguz%2BgSJyVSmT0JPmuXeOt4bMCnQYGl7VJQbaTaC3vhjhlAaKEfcfSxZP2oFMITX91VdDwW8pwOTNd0wkF51UD%2FJHJNBbOXcM2KgTaPJvnaytPoZ%2B%2F3Ctk%2B04ZJydoQWeMxHIguVzZJJundilntL6%2FrHhKTkQFP3j6t2KPoj60HEbxjg41UKc1fbktwW06l0yyVAfHxPDkygO%2B47%2Fyt2ySYallFKO5%2BBpCpLZfM%2BNTSs%2F9kkGfArA0oiYvXxnTSe1GSio2jpGxUgJJtDdq6DAcZxhq3ocpGBrzZp9xEO9s7fXNyihIyw7saRbepYu9hDl1%2FjAS%2BuaaYawWKnRmCLnup0ziPxH0ndz%2FjL8CZhL4YYeaA3C32O4DUh%2FoYmV6YUuVAxkfJVDA7aVbx7D%2Fod27SJ3EHDmTi6o3wAvpCW2XpgxG5zV1%2BpHtZYqYSQT2T0tHFgt98zQTgdALyjeAaDOyW&retcode=00&retmsg=%B2%D9%D7%F7%B3%C9%B9%A6

$request->getQueryParams() // NULL

Can you show a little more of your code, particularly the route that handles this request?