Create/Update Tokens via REST API

Hi I am trying to create/update tokens in a folder using this reference https://developers.marketo.com/rest-api/assets/tokens/

I have made a post request in python as per the url 442-whj-204.mktorest.com/rest/asset/v1/folder/{folder id}/tokens.json?access_token={token}

with the header as content type application/x-www-form-urlencoded and data passed as per instructed, however I get an error code 600 access token not specified. 

I use the same format for the bulk activity download with no problems

Is there a different way to provide the access token for this type of request?

Thanks,