After your initial configuration and setup of the Simplify eCommerce application from Shopify, you may need to change your integration end point.  For example, if you started using the Xero cloud accounting software with Simplify and have now changed to QuickBooks online, you will want to switch our end point to seamlessly create invoices and transactions in QuickBooks.  


Note: these instructions can be followed for updating configurations such as chart of accounts mapping.


From your Shopify account, click on "Apps" on the left side menu and then click on Simplify.


After the application opens, click on the profile drop down arrow and then Integration


This will show a list of available integrations.  Select the new integration that you'd like to connect to.  


In this example, I clicked on QuickBooks.  It will walk through a setup wizard to finish the integration.