Please use JWT authentication if possible. More details in the online documentation.

Pass "Token 71cc5aaa03784821e142c082f1827ea82d972e00" in the Authorization header to use it

Example with curl:

curl -X GET https://wger.de/api/v2/routine/ \
     -H 'Authorization: Token 71cc5aaa03784821e142c082f1827ea82d972e00'