In order to call any Salsify APIs, you must provide your authentication token. The auth token is specific to a user account (not an organization). Treat this token as you would your own personal password -- don't send it to anyone, and make sure to store it in a safe place
Your auth token can be retrieved by going to Profile (upper right)->API access->Show API Key. You will be asked to re-enter your password to show your API key.
Once you have your auth_token, it can be passed in as an http header:
curl 'https://app.salsify.com/api/imports/upload_mounts' -X POST --header "Authorization: Bearer <your auth token here>"
We also support passing the authentication token via an access_token query parameter:
https://app.salsify.com/api/v1/products/1234?access_token=<your auth token>