How do I apply Dynamic Linking to batch payments with multiple payees and amounts?

The Payment Service User (<a href="/glossarycollection/payment-service-user" style="color:#48277C;" target="_blank" title="Payment Service User">PSU</a>) only has to perform Strong Customer Authentication (<a href="/glossarycollection/strong-customer-authentication" style="color:#48277C;" target="_blank" title="Strong Customer Authentication">SCA</a>) once for the batch. The unique Dynamic Linking code used must be linked to the sum of every transaction in the batch. If any of the amounts or payee details change this must invalidate the code. 

If you are a Payment Service Provider (<a href="/glossarycollection/payment-service-provider" style="color:#48277C;" target="_blank" title="Payment Service Provider">PSP</a>) that already offers corporate payments then you may want to consider whether you are able to use the SCA Corporate Exemption (<a href="/glossarycollection/open-banking-implementation-entity" style="color:#48277C;" target="_blank" title="SCA Corporate Exemption">Corporate Exemption</a>) to avoid having to apply Dynamic Linking on your corporate accounts.