Is there an interface between Quickbooks online and Mail Chimp?
QuickBooks Online integrates with different kinds of third-party applications and I'm here to guide you how, karencoleman27.
You can go to the Apps Center and check for the application that you want to use. If you're able to view it from there, then QuickBooks is compatible and works with Mail Chimp. However, for the integration process, I recommend reaching out to their support team to give you the step by step process.