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

Pass "Token 419a35e5760714dfe8ea0e6a9b09b0e8dc4db5c3" in the Authorization header to use it

Example with curl:

curl -X GET https://wger.de/api/v2/routine/ \
     -H 'Authorization: Token 419a35e5760714dfe8ea0e6a9b09b0e8dc4db5c3'