Return the set of stored PaymentInstruments for the specified Customer.
PaymentMethod : String (Optional)
Optional parameter used for filtering. If provided, then only customer payment instruments with a payment method matching the passed value are returned. If a customer payment instrument has a null payment method, then it is always returned.
Customer : Customer (Required)
Custome to get payment instruments from. Must represent a registered customer, otherwise the pipelet throws an exception.
PaymentInstruments : Collection : (Required)
An (possibly empty) iterator containing all credit cart objects of the current user.