Normally, you will get the API URL in App like this:
https://iot.seeed.cc/v1/node/GroveTempHumD0/humidity?access_token=962a6d7dca54bc4cbf01b9fc92bb49cc
If you wanna accessing Wio Link and Grove in terminal, the commend should be like this:
curl -H "Authorization: token 962a6d7dca54bc4cbf01b9fc92bb49cc" https://iot.seeed.cc/v1/node/GroveTempHumD0/humidity
Not include the “?” character.
Reference: iot.seeed.cc/getting_started.html