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Final testFinal test 

How to integrate Quickbooks to salesforce through Apex code using RestAPI

Here the link https://developer.intuit.com/app/developer/appdetail/test/keys?appId=djQuMTo6OGQzYmJlYTI3Yg:28b7be2d-c664-4ac0-ad2c-562815330815
in which i created connected app as a third party, i am not getting how can i get Authorization code for access token?
AbhishekAbhishek (Salesforce Developers) 
You have two routes: spend money on an existing integration, or spend time and build your own integration using the freely available APIs.

Here's Salesforce's developer documentation, https://developer.salesforce.com/docs/

And here's QuickBooks Online API documentation, https://developer.intuit.com/docs/api/accounting

With the information contained on those two sites, and in a couple of hundred hours, you might have a working integration.
(if a couple of hundreds of hours seems like a lot, our integration, Breadwinner, which connects Salesforce to Xero & QuickBooks Online, has taken a total of 25 developer years so far to build)


 
SergeiSergei
Here (https://skyvia.com/blog/salesforce-quickbooks-integration-3-ways) is a usefull blog post on how to integrate Salesforce with Quickbooks in 3 different ways, including REST API.