Just as a side note. Make sure to use the token calls on the backend workflow. I believe it’s safer that way if I’m not mistaken. Someone else can chime in if they feel I’m incorrect. Hope that makes sense. 
Yep! Both redirects are the same, the message does not appear if I use a non-generic redirect ie: an actual page in the app (kinda stupid of me because I have been using the generic redirect url provided if user agent flow is selected as the authentication type.)
Also, thank you on backend workflow advice. It makes sense.
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Good. 
It seems like you have everything working properly then?
At the moment I am all set. Thank you @J805 !
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Awesome 
Glad @Jici and I were able to help.
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You were amazing man! Thank you!
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Hi @rony.kris ! Could you explain to me about Authorization: what value should be after Basic; and about code in parameter: where did you get this value? And maybe you could share link to an editor or some screenshots for me? I try to set Quickbooks integration a very long time, but I can’t figure it out until the end.
Thank you in advance!