you should definitely check out the merchant of record model. Funnily enough, I work in the payments space and this is a use case we see all the time - as businesses start scale and hit tax thresholds, they start implementing even more tools to handle this on top of their existing payment stack.

Instead, perhaps consider a billing platform that handles payments, subscriptions and sales tax all in one. With the merchant of record model, you remove the need to worry about sales tax altogether, the payment provider does so on your behalf (including liability if there is a miscalculation). Shoot me an email if you want any more info nick.read @paddle.com, happy to provide more info