Login to external API using oauth1

I am trying to use the shapeways API.

The main problem I have is the Oauth1 authentication. Any information on the steps that are required will be very helpful.

I have been trying to use OAuth1Binding from the oauth1 package. I am able to get the requestTokenSecret but the requestToken appears as undefined.

For the request token I think that the API needs a GET call, see picture below:

but OAuthBinding, has a POST method to request the Token,
see here

The same happens for the with the method to get the accessToken.

I’ll try to fork the oauth package and change the methods.