There were many discussions right after the law was enacted, and at that point, the consensus was that it is OK to collect the credit card number for the CB.
It would however be against the intent of the regulation to collect the credit card information for the appraisal, even if it was not used until the proper time. The customer might feel obligated to complete the transaction because they gave you the number and authorized the appraisal.
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Integrity. With it, nothing else matters. Without it, nothing else matters.