Pay by Link needs to be installed on your Yetipay terminal as a separate app.
To add this app you need to:
Adding Terms & Conditions
To enable Pay by Link, please add your Terms & Conditions for your business/site within BaseCamp.
Find the site, and click the edit icon for the site;
Right at the bottom of the edit site form, you’ll see a checkbox and a URL input field;
Tick the tickbox and add your T&Cs, this will be visible to your customers when they pay.