Executive Summary

Problem Payment methods displayed randomly, causing cognitive overload and suboptimal method selection
Solution Data-driven reordering with progressive disclosure (top 4 visible, rest in accordion)
Key Result +€47K EBITDA
A/B Testing Growth & Monetization ablefy

Payment Flow Optimization

How a data-driven redesign of payment method selection increased net take rate to 3.10% and generated +€47k EBITDA.

Winning Payment Flow Design
Role & Team
Lead Designer Partnered with Data Team, PM, Engineering
Duration & Scope
42 Days 790K sessions, A/B/C test design
Key Metrics
3.10% Net Take Rate +€47K EBITDA, p-value: 0.00001

Why was checkout optimization strategically important?

Checkout is where sales are won or lost. When looking to boost conversion—which is essential to both our sellers' success and ablefy's growth—one issue stood out: payment methods were shown in random order.

This lack of logic meant buyers weren't guided toward better options, leading to more failed payments and higher costs. We saw an opportunity to fix that.

What were the core UX and business problems?

Crowded Options

Displaying too many payment methods increases cognitive load, making it harder for users to decide.

No Prioritization

High-adoption, low-failure methods (like Apple Pay, Klarna, SEPA) weren't featured prominently.

Real Risk

Fragmentation led to suboptimal method use—impacting both seller payout and platform profitability.

How did we use data to inform the design?

Partnered with the data team to build a payment methods matrix measuring:

1

Popularity

How often each method is selected by buyers.

2

Success Rate

Percentage of completed payments without failures.

3

Take Rate

Net profitability per payment method.

Using this data, we identified an optimized order that could maximize both adoption and platform profit: PayPal, Klarna, SEPA, Apple Pay, Bank Wire, Google Pay, Card, Ideal, P24, Sofort, Pay Later.

What constraints shaped our approach?

We identified payment methods with beneficial attributes for payer adoption, failed transfer rates, and price. We wanted to increase the share of these methods to boost revenue for sellers—and ultimately ablefy.

Since we can't remove any seller-selected payment methods, we focused on visually guiding users to the top options. A large-scale experiment would show us which design actually drove the best results.

What hypotheses did we set out to test?

Hypothesis 1: Profitability

Implementing a horizontal payment selector—showing only four options without scrolling—and reordering payment methods will steer users toward more profitable choices, increasing net take rate.

Hypothesis 2: Conversion

A horizontal payment selector showing only four options will make it easier for users to choose, leading to more buy button clicks and successful payments.

What did the original design look like?

The control was a traditional vertical list showing all payment methods stacked. This created cognitive overload—users had to scan through 7+ options with no visual hierarchy guiding them toward optimal choices.

Control — Vertical list (old design)
PayPal
PayPal
Klarna
Klarna
Sepa
SEPA
Apple Pay
Apple Pay
Bank wire
Bank Wire
Google Pay
Google Pay
Credit card
Credit Cards
iDeal
iDeal
Przelewy24
Przelewy24
Pay later
Pay Later

All 10 payment methods visible at once. No visual hierarchy. Random order based on legacy logic.

What design variations did we test?

We tested two new horizontal layouts. The key difference was on desktop only—Variant B hides additional payment methods behind an accordion, while Variant C shows all methods at once. Mobile experience was identical across both variants.

Variant B ✓ Winner — Accordion collapsed
PayPal
PayPal
or
Klarna
SEPA
Apple Pay
Show more payment options
Bank wire
Google Pay
Credit card
iDeal
Przelewy24
Pay later

Only 4 methods visible. Click accordion to reveal 6 more: Bank Wire, Google Pay, Credit Card, iDeal, Przelewy24, Pay Later.

Variant C — All methods visible
PayPal
PayPal
or
Klarna
SEPA
Apple Pay
Bank wire
Google Pay
Credit card
iDeal
Przelewy24
Pay later

All 9 payment methods visible at once. More cognitive load, +14.3% buy button errors.

How did we structure the experiment?

42 Days Running

Duration of the A/B/C test to achieve statistical significance.

790k Sessions

Total sessions included in the experiment.

10→100% Rollout

Gradual increase from 10% to full traffic.

Tool used: Statsig

What did the data tell us?

Variant B performs best with statistical significance (p-value: 0.00001)

Net Take Rate: ~3.10%

Variant B achieved the highest net take rate, outperforming both control and Variant C.

EBITDA: +€47,088

Variant B generated €774,772 in EBITDA—€47k more than the control group.

Variant C: No Significant Change

Slight decrease in buy button clicks and order creation, but not statistically significant.

Experiment results chart
A/B/C test results showing Variant B's superior performance
Variant Net Take Rate EBITDA Δ vs. Control
Control ~2.91% €727,684
B ~3.10% €774,772 +6.47%
C ~3.06% €753,900 +4.51%

Statistical analysis from Statsig confirming significance (p-value: 0.00001)

What did we learn about user behavior?

Pay Later: -30% Clicks

Hiding Pay Later behind the accordion led to 30% fewer buy button clicks for that method (statistically significant). This was intentional—Pay Later has lower margins.

Apple Pay: Significant Increase

Apple Pay saw a significant increase in both clicks and completed orders, whether or not the accordion was used.

Klarna: Moderate Increase

Klarna had a moderate increase in clicks when all options were visible (no accordion).

What was the business impact?

Design Drives Unit Economics

Prioritizing high-margin methods increased Net Take Rate to ~3.10% and generated +€47k EBITDA.

Friction as a Filter

Hiding Pay Later dropped usage by 30%, while high-intent methods like Apple Pay remained unaffected.

Organization > Minimalism

Progressive disclosure (Variant B) outperformed the visually "cleaner" list (Variant C), proving clarity beats simplicity.

Business impact visualization
Visualization of business impact across variants

Reflections & What I'd Do Differently

1

Consider localization earlier

Payment method preferences vary significantly by country. Future iterations should test region-specific ordering to maximize local conversion rates.

2

Monitor long-term effects

While short-term EBITDA increased, we should track customer satisfaction and return rates for users who were "nudged" toward higher-margin methods.

3

Build a self-optimizing system

Rather than manual reordering, we could implement ML-based dynamic ordering that adapts to real-time conversion data and user preferences.