Ali Demirbaş - Lab
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Cart & Checkout

Testing One-Click Saved Card Payment at Checkout

Offering a saved card may remove the need to re-enter payment details and help more shoppers complete payment.

  • Checkout
  • Payment completion rate

Control vs Variant

Absent on one side, present on the other.

Changed
Presence
Page
Checkout
Difference
added

Hypothesis

Keep required verification in place; “faster checkout” does not mean every purchase takes one click.

How to run this test

Primary metric

Payment completion rate

Compare orders placed by assigned checkout visitors who are eligible for saved-card checkout.

Other metrics

  • Payment method selection rateTrack which payment method visitors choose.
  • Payment-step completion timeCheck whether the payment step takes less time.
  • Payment error and decline rateTrack errors and declines during payment attempts.
  • Post-purchase cancellation rateCompare order cancellations over the same follow-up period in both arms.

What to check before and during the test

  • Payment optionOffer saved-card checkout to eligible users who have a saved card; keep manual entry available.
  • Keep constantKeep manual card fields, payment provider, validation and checkout flow unchanged.
  • SelectionTrack preference for saved-card checkout versus manual entry.
  • DeviceReview mobile and desktop separately.
  • Separate testsDo not include option placement, default selection or provider changes in this test.

Setup mistakes to avoid

  1. 1Do not require saved-card checkout; keep manual entry available.
  2. 2Avoid oversized callouts that disrupt the page.
  3. 3Keep the card-entry design unchanged during the test.
  4. 4Do not let the saved-card option crowd the mobile screen.
  5. 5Do not preselect a saved card without the user's consent.