In MX4 when at the payment screen, it was defaulted that the card info would be vaulted. However, if you did not want the CC info to be vaulted you could simply uncheck that box. When merchants have multiple recurring customers but pay with different cards each month, the mandatory vault function brings up multiple cards to choose from which is confusing and creates potential for error. Please make vaulting "on" by default if you like but ultimately the option of the merchant.
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Including more detail - when sending invoice to merchant and they pay, the card should be vaulted to their account. Was trying to use this method to update card information for customer that could then be chosen to update a recurring profile. It would be nice if from the recurring profile after a decline an invoice could be sent to request new card information for the declined payment then the card would save to their account and could be updated to the recurring contract. (This is not asking for the ability to login/update their own profile, but would give the ability to send an invoice from their existing customer/recurring to provide new payment information.)