When registering a payment token, validating it using a payment of a small amount followed by a refund
allows ensuring that the method is valid (i.e. checksumming the card number simple ensure the number
is valid but not that the card exists). This commit introduces a generic approach that must be implemented
for each acquirer that has tokenization support. This commit also introduces a generic payment token registration/usage template that can be adapted according to one's need.
payment_ogone: add support for tokens validation