API access to Intervals.icu

[app4g]

I beleive you’re usigthe wrong endpoint

Swagger UI

/api/v1/activity/{id} <<< should be this one i believe

or are you trying to get the FIT file?
also take a look here

Intervals.icu API Integration Cookbook

This tells you everything you need to know to get completed activities into Intervals.icu, to download planned workouts and to read and update wellness data. Example calls use curl so you can easily try them out. Sources: API access to Intervals.icu Intervals.icu OAuth support Intervals.icu API docs Authorization Apps need to use an access_token obtained via OAuth. If you are just working with your own data call the API using your personal API key (available towards the bottom of the setting…