Mostly as the title states. I am trying to create a basic checkout using the integration builder with React and a Flask backend. Currently, I can request an access token and use it to generate a client token with OAuth2, but when I try to generate a token and use it for creating orders, I get an authentication failure. I know the issue isn't with my API keys, they both have full permissions and are sandbox keys. I've barely made any progress so far because the integration builder has been wrong several times. I would like to move on but I legitimately have no idea what I'm doing wrong. Any help is appreciated.
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