Magento

Dear Forum,

I am migrating from OS commerce to magento but have hit my first major stumbling block. The off line credit card system doesn’t allow for some uk debit cards ie issue numbers.  Currently my top three payments type are mastercard, delta and JCB.  Master card is fine but the other two the system doesn’t seem to handle.

Is therea method for expanding this to take these cards? 

Thank you for reading

David