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I used this SDK to develop an API that connects directly to Quickbooks.

I had this error once: Authentification failed when I tried to fetch data from the API. My identifiers were correct.

The problem came from some warnings I had in my program.

It may sound obvious but make sure you have no PHP errors or warning in your application. Otherwise, the web connector of Quickbooks won’t be able to read data from your API.

2017 update

Seems like Quickbooks developed its own SDK. It might be a better option to use for your APIs ?