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John Lee 94John Lee 94 

Help newbie - how to use API (SOAP or REST) to upload files to contact

Hi Everyone, I am new to salesforce APIs and I am tasked to create a console application to upload all NDAs signed in DocuSign ... I was able to download all docusign envelope documents ... now I need to upload those documents using Salesforce API. what my client structured is that they created contact and then created folder (object? i do not know the term) NDA under related tab, the url like  {NDA ID}/related/NDAs__r/view .. my code need to upload multiple files to that folder. Can someone point me out the basic of how to authenticate my app, what are the APIs to use to locate that contact and find that NDA folder, the then upload the files.

Thanks a million!
John