Hello everyone, and welcome to the community forums!
Bill dates on existing subscriptions can't be modified, because this affects the contract between buyer and seller established at the time of the subscription. You and your buyer can establish a new recurring payment profile, with the new date.
Since all of you are using recurring payments, you may want to take a look at the features of Enhanced Recurring Payments to see if there are any other features available there that strike your fancy. It doesn't allow the modification of the bill date, but you may be interested in some of the other elements it offers.
I hope this helps!
Olivia
... View more