As part of Dynamic Linking do I need to show the unique code generated to the individual authenticating the transaction?

You are not required to show the unique authentication code required for dynamic linking to the Payment Service User (<a href="/glossarycollection/payment-service-user" style="color:#48277C;" target="_blank" title="Payment Service User"><u>PSU</u></a>
<a href="/glossarycollection/primary-technical-contact" style="color:#48277C;" target="_blank" title="Primary Technical Contact"><u>PTC</u></a>). In fact, you should not do this to reduce the risk of 'man-in-the-middle' attacks. The code must be uniquely linked to the amount of the transaction and the account details of the payee. If any of this information changes the code must be regenerated.