Payment will have to be made by bank transfer prior to shipping.
You'll have to do a bank transfer before we ship ...
ーPayment will have to be made by bank transfer prior to shipping.
「支払いは発送前に口座振込となります」
payment で「支払い」
bank transfer で「口座振込」
prior to ...「…より前に」
ーYou'll have to do a bank transfer before we ship ...
「…を発送する前に口座振込ください」
ship で「発送する」
このように言うこともできると思います。
ご参考まで!