Hy there i am john, A customer support executive in quickbooks online . Why to use quickbooks mailchimp integration? Integrating QuickBooks and Mailchimp can help businesses improve their marketing and financial processes. QuickBooks is an accounting software that manages financial transactions, while Mailchimp is an email marketing platform that helps businesses connect with their customers. Integrating these two tools can help businesses automate email marketing campaigns and track the financial impact of those campaigns. By syncing customer data between QuickBooks and Mailchimp, businesses can create targeted campaigns and track the success of those campaigns in terms of revenue generated. QuickBooks and Mailchimp integration can help businesses save time and improve their marketing ROI.