[Wishlist] MemberStack API needs Stripe customer ID parameters for headless integrations

It would be ideal if there were additional parameters for the member create or update api endpoints to allow setting of the stripeCustomerId/stripeSubscriptionId values. The manual import tool to connect a preexisting stripe customer to a memberstack member is not a feasible solution as I am specifically looking for a headless solution. This could also be a test mode only option if that increases the likelihood of this feature.