DAY 9 Payment Service & Trust Audit Codex AI Lab

Designing a payment service

Before mechanically processing the connection with an external PG company, this is an AI auditing exercise that designs a flow that allows users to make payments with peace of mind without leaving and reinforces failure exceptions and UX trust requirements.

← Day 9 Go to main classroom
TASK 1
Planning Task 01

Design your payment flow

We design a simple three-step payment flow that dramatically reduces churn by merging multi-step pop-ups and unnecessary elements from product selection to final approval.

expected output

  • day9_current_checkout_flow.md improvement
  • Simplified TO-BE order payment flow
Task 1 Enter the lab →
TASK 2
Exceptions Task 02

Review payment failure scenarios

Establish a safe phrasebook and double billing blocking lock (disabled/UUID) with action suggestions for each raw error, such as card limit exceeded, communication delay, duplicate submission, etc.

expected output

  • day9_raw_payment_errors.json mapping
  • Secure Stationery and Dual Admission Controls
Task 2 Enter the lab →
TASK 3
UX Audit Task 03

Improve your payment experience

To eliminate anxiety about phishing sites with only prices on a white background, receipt-style price segmentation discount notation, secure communication notification, and refund link are implanted into the UI.

expected output

  • day9_payment_ui.html Vulnerable Diagnosis
  • Secure Badges and Receipt Segmentation HTML
Task 3 Entry into the lab →
MISSION 1
Failure Guide Mission 01

Responding to payment failure situations

We assemble an error solution book that alleviates users' fears when the PG window is forced to close or attempts to make a duplicate payment during a bank check, and suggests trying again or checking the status of My Page.

expected output

  • day9_failure_scenarios.md
  • Situational Behavioral Solutions Feedback Guide
Mission 1 Lab Entry →
MISSION 2
Friction Audit Mission 02

Direct inspection until purchase is completed

We go through all stages from the shopping cart to the order completion page, and when returning from coupon search, we discover the peak friction of loss of delivery address form and submit a repair report first.

expected output

  • day9_checkout_journey.md
  • Priority A/B prescription to eliminate purchase abandonment rate
Mission 2 Lab Entry →