How to integrate Salesforce with Asana with a Premium account

Can someone please help me with this? First of I have Premier Account. I DO NOT have Business account and I can’t sign up for one at this time so I need a solution with premier. I am trying to connect tasks and contracts in Asana and send that data over to Salesforce. Is there a tutorial or API example on how to do this with premier account? Most documents have examples only for business accounts. I am reading the API documents and they have samples for other languages and nothing for SF Apex. Is there even an Asana API option where I can call it from a web service that is written in SF to get the Asana response containing tasks/contracts? If someone can help with examples and code samples that would be great. Thanks

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