The OAuth call you are making has a parameter called redirectUri.
Look for &redirect_uri= in the URL.
You have to change that for each location, if you put this in a domain - then you cannot use localhost in there.
This URL has to match exactly to where you deployed your application.
For the second call, make sure to make it a POST, not GET, add the headers like this: (more information)
curl --header "Authorization: Basic NWMyYjhkN.....FhODg2MQ=="
--data "grant_type=authorization_code&code=eyJ0eXAi.....QFsje43QVZ_gw"
--request POST https://account-d.docusign.com/oauth/token
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