Oauth2 flow implementation in javascript code in ZAP

I need to create Zapier ZAP and call Quicbooks Online API to create Employee using Javascript code as Quickbooks Zapier App for Quickbooks does has Action for it. Quickbooks uses Oauth2 authentication. Is there any way available to implement Oauth2 flow in Javascript code in Zapier, so access token can be received from Quickbooks and API can be called?

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