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A simple plug & play solution to using Avalara’s AvaTax for charging sales tax isn’t very well documented. This post is all about laying out the required steps to making it work quickly and easily. For AvaT to integrate with Stripe, you have to give Ava tax to a chance to catch new invoices and add the sales tax to the invoice. You do this by sending the attribute.pay_immediately = false to Your Subscription Creation Request.