What is the fine-grained topic of the following text: Once the payer has adjudicated your claim for payment, a unique 16-digit PAN (Primary Account Number), the virtual card number, is sent by Rete+Pay on behalf of the payer to the provider by secure PCI Compliant Fax or U.S.P.S mail along with your Remittance Advice. Only return the topic.
Sending of Virtual Card Number after Claim Adjudication