Adding new card to existing customer?

[chrisvidal]

How would you add a new card to an existing customer?

I tried the createCard and updateCustomer methods but received this error every time:

Argument 1 passed to Omnipay\Common\CreditCard::initialize() must be of the type array or null, string given, called in /Users/mememe/Sites/blabla/vendor/omnipay/common/src/Common/CreditCard.php on line 145

or

Resource was not found from Omise APi