Can I generate the Client Identifier and the Shared Secret for my QuickBooks Online account?

Can I generate the Client Identifier and the Shared Secret for my QuickBooks Online account?

You need to log into your QuickBooks Online Portal by supplying your credentials and obtain the Client Identifier and the Shared Secret from under the My Apps screen.
The Tagrain QuickBooks Online Integration plugin is not available for activation if you are running the 14-Day trial evaluation of Tagrain.
Plugins in Tagrain are either Subscription Based or License Based. So the price that you pay for your plugins is based on the number of POS terminals that you have in your setup and the number of licences that you have acquired.
There will be no change in your subscription amount in the current billing cycle if you are only deactivating the Tagrain QuickBooks Online Integration plugin AND not updating your Store / POS count.