I see there's a QB integration, but would love to see a Xero integration.
I have an accounting firm that works with startups (and more) and we are solely on Xero for the accounting platform (it's just the better app).
To get started, please have your dev team make an API and reach out to Xero API team to start the certification process:
https://developer.xero.com/documentation/xero-app-store/app-partner-guides/app-partner-steps/#1-start-building-your-integration-to-xero