'X-API-KEY': '<API-TOKEN>'
'X-CONNECTION-ID': '<CONNECTION-ID>'

Authentication is handled by two different headers, both are required.

X-API-KEY:

This is your API token, this will be provided to you at onboarding.

X-CONNECTION-ID:

This is the connection ID representing an end-user’s data source, this connection must be a valid connection id that belongs to your account.