Adding functionality when saving a CRM order

Hello. I am trying to encrypt payment card numbers at the time that the orders are saved in CRM.

I believe that I can retrieve the payment card information just before the order is saved using the CRM_ISAI_BASKET_GETPAYMENT function. This function returns a structure that contains the card number.

Is there an internal table that I can access (or is there a function or BADI call) by which I can modify the payment card number? After I have encrypted the card number, I would like to modify a temporary table (if one exists) before the data is committed to the permanent tables.

I have brought up the COM_PAYPLAN package through the object browser, but I am not familiar with the functions I see listed there.

Due to implementation requirements, I cannot encrypt the card number at the time of authorization.

Thanks.

Brendan Farragher