Thank you for your reply Yes I have store, but still have not created an app for thisWhy do we need to create App for this Can we use shopify flow instead of creating webhook , because we are on Shopify plus 

We want to track so that whenever a customer makes a transactionWe can automatically send them an email asking them about their satisfaction using the third party system So we need the APIs to send the customer email to the third party we used when a...