By default PayPack’s integrated payment processing solution for Stripe displays under the Customer record PayPack tab.
To enable the ability to add new card payment methods to a customer on NetSuite transactions (e.g. Sales Order, Invoice), check the configuration box label Enable Add Card on Transaction.
Before hitting save, make sure to check Enable SuiteApp to turn PayPack on.
When you navigate to a transaction, the PayPack tab will include Add Card subtab.