Understanding the Changing Economics of SEPA. Customers won't use SEPA unless it's better than what they have currently. The ability to convert electronic invoices into payments will be a huge benefit for the customer. TWIST is an e-invoicing proposal based on the Finvoice standard. If banks provide this service they'll be able to use their existing customer checks to prevent fake invoices. Customers will need fewer bank accounts. For SEPA to really bring value it will need to look at interaction with other international systems as well as standardising processes within Europe.