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It can be combination of two ways :
1. Apex callout : Make a http callout to post/get any data from service to salesforce.
2. Apex Rest Webservice : Write a cusom webservice class which can be called out from outside salesforce to Get/Post/others data.
Thanks
You can refer to this link https://getoncrm.com/steps-to-integrate-quickbooks-with-salesforce/
This GIT link https://github.com/amitastreait/Salesforce-Quickbooks-Integration has the clear code which uses OAuth 2.0
Also, recommend reviewing
https://salesforce.stackexchange.com/questions/21517/quickbook-to-salesforce-integration
https://salesforce.stackexchange.com/questions/130269/how-to-connect-salesforce-to-quickbooks
Hope this helps you. Please mark this answer as best so that others facing the same issue will find this information useful. Thank you