Hello, if I amend a customers info, specifically their payment date within stripe, will this then update memberstack so that it reflects the nw payment date on their membership?
Hey James 
If you update the billing cycle anchor in stripe it will update in Memberstack. What will not be updated is if you change a subscription to another membership in stripe. 
Do you know anyway to bulk change the billing cycle in Stripe @Josh-Lopez? My client wants to reset billing on all customers subscriptions to the same date, is this possible from Stripe or even MS please?
Hey Ian
We do not have a way to do this on our side yet. You may be able to do it in stripe but this may take a developer. More info can be found here from stripe.