What's causing the sudden 50% increase in failed transactions for LinkAja's bill payment service this month?

Introduction

The sudden 50% increase in failed transactions for LinkAja's bill payment service this month is a critical issue that demands immediate attention. As we delve into this problem, we'll employ a systematic approach to identify, validate, and address the root cause while considering both short-term fixes and long-term strategic implications.

Our analysis will follow a structured framework, beginning with clarifying questions to establish context, followed by a thorough examination of potential causes, data analysis, and hypothesis formation. We'll then move on to root cause analysis, validation steps, and finally, a comprehensive resolution plan.

Step 1

Clarifying Questions (3 minutes)

• I'm noticing the issue is specific to bill payments. Are other transaction types on LinkAja experiencing similar problems?

Why it matters: This helps isolate whether the issue is specific to bill payments or indicative of a broader system problem. Expected answer: No, other transaction types are performing normally. Impact on approach: If confirmed, we'll focus our investigation on bill payment-specific systems and processes.

• Given the 50% increase, I'm wondering about the timing. Did this spike occur suddenly or gradually over the month?

Why it matters: The pattern of increase can indicate whether it's due to a sudden change or a gradual degradation. Expected answer: The increase occurred suddenly, starting about a week ago. Impact on approach: A sudden spike would lead us to investigate recent changes or events that coincide with the onset of the problem.

• Considering user segments, are all bill payment users equally affected, or is the issue more prevalent in certain demographics or regions?

Why it matters: This helps identify if the problem is universal or specific to certain user groups or geographical areas. Expected answer: The issue seems to affect users across all demographics and regions equally. Impact on approach: If confirmed, we'd focus on system-wide issues rather than user-specific or regional factors.

• I'm curious about any recent updates or changes. Have there been any significant system updates, new feature rollouts, or changes in payment partners in the past month?

Why it matters: Recent changes are often the culprit in sudden performance issues. Expected answer: A system update was deployed two weeks ago, and a new payment partner was integrated last week. Impact on approach: This information would guide us to investigate these recent changes as potential root causes.

• Regarding the definition of 'failed transactions', has there been any change in how this metric is measured or reported in the past month?

Why it matters: Ensures we're not dealing with a change in measurement rather than an actual increase in failures. Expected answer: No changes in the definition or measurement of failed transactions. Impact on approach: Confirms that we're dealing with a real increase in failures, not a reporting anomaly.