In case someone is interested, with a bit of #cURL and #jq you get the JWT tokens out of #Garmin connect so that you can use your data from their site without registering an app (which is quite hard) https://github.com/michael-simons/garmin-babel/blob/main/bin/retrieve_garmin_tokens.sh
#Garth exists https://github.com/matin/garth but its proper OAuth flow always go trough a fixed consumer token…