Trying to generate Tokens for a tool that programmatically pulls data down



I’d like to be able to generate 4 tokens for a tool that we’re making with the ad words API that allows us to pull data down from Twitter. I was advised to use the 3 legged O auth flow. However because my too isn’t meant to be used by a user this doesn’t seem like the right method.
I already have one valid token that goes through application only oauth - we just want more of those.

Can anyone assist?