I watched a vid about OAuth best practices. It is pretty unclear to me how he got the callback URL like, where is this coming from? Is this something I should provide?
Yes, you’ll want to provide this URL. It’s the URL that you want the sellers to go to after authorizing your application. 
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And after getting the callback URL, how am I supposed to use that to get the code? Since it is required when using the “authorizaion_code” grant type
The code will be included in the callback URL. When the seller is redirected you can get the code and use it to call ObtainToken.
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