Hey there, @joearaneta.
Thanks for reaching out in the QuickBooks Community. As we're waiting for your response to Fiat lux question, we'd like to suggest contacting your CRM software provider first.
This will help us check if they are integrated with QuickBooks Online.
In the meantime, you can search for the Apps that works with QuickBooks in link: https://quickbooks.intuit.com/app/apps/home
I'll be here if you have other questions. You take care and have a great day!
What kind of business do you run? A retail/wholesale company?
By the way, why are you still using QBD 2019, not upgrading to QBD 2020 or 2021? Intuit only supports QBD 2019 until May 2022 and you won't be able to sync with 3rd party apps.
Explore this app
You can consider cross-grade to QB Desktop 2021 Premier with the one time license to lower your expense than paying the annual subscription for QB Desktop Enterprise.