Has anyone used the app Refundably, it does appear to solve the no tax on partial refunds issue? Can anyone tell me if Refundably will work with Avalara?

The Shopify Sales Tax ID would be your "Taxpayer number" in Texas. I believe the Shopify Sales Tax ID field is a dummy field and you can put any value there and it would not make a difference. 

We are having the same issue. We are overpaying tax on TikToK transactions.

I have a subscription based business. We want to offer "3 easy payments" on some subscription products. So the delivery and payment increments would be different. Payments would be monthly, and delivery would be every 3 months.Does anyone know of the...

Did you find a solution? We are doing something similar except the installments will span 3 months.The physical product is shipped on installment 1, installment 2 and 3 are payments only. (3 easy payments) 

What payment provider did you end up going with. We also need to charge customers in different increments to their deliveries.