You need to have a SimplyTapp card credential on your mobile device to test.
To get a card credential, get the Tapp app from the play store or run through the Self Driven HCE Pilot
SimplyTapp's e-Merchant checkout is simple. Install the checkout just as you would most other online checkouts and the next time a customer checks out with the SimplyTapp Checkout feature you same money while the consumer saves time.
Step 1 - Install SimplyTapp Checkout button
Step 2 - Check Out - User fills basket and clicks the SimplyTapp Checkout button.
Step 3 - Personal Payment Options Selected - User is redirected to their personal wallet where they select a payment card to use.
Step 4 - Check Out Complete - User is directed back to the e-Merchant's checkout page or a page of their choose with a completed card present transaction.
It is that simple.