Have you applied for a contingency mechanism exemption?

If you want to avoid doubling your <a href="/glossarycollection/the-second-payment-services-directive" style="color:#48277C;" target="_blank" title="The Second Payment Services Directive">PSD2</a> interface effort then you'll need to try and obtain an exemption from providing a contingency interface. 

Under the Regulatory Technical Standards (<a href="/glossarycollection/regulatory-technical-standards" style="color:#48277C;" target="_blank" title="Regulatory Technical Standards">RTS</a>), if you haven't been granted an exemption you'll need to provide access for Third-Party Providers (<a href="/glossarycollection/third-party-provider" style="color:#48277C;" target="_blank" title="Third-Party Provider">TPP</a>) on your main direct internet channel. This means that you'll need to implement what known as a 'Screen Scraping +' interface whereby TPP's can access data via screen-scraping a standard web-browser connection from a user.