Ecommerce Payment KPIs: What to Measure and How to Improve Payment Performance
Published - 20 February 2025
Revised - 17 August 2026
Written by Libby James
Libby James is the founder and Managing Director of Merchant Advice Service. Since 2016, she has worked directly with businesses and payment providers across merchant accounts, card processing, payment gateways and complex provider requirements.
Libby specialises in high-risk, declined and harder-to-place merchants, as well as businesses requiring specialist payment methods, integrations or international support. She writes and reviews Merchant Advice Service content, drawing on practical experience gained from real merchant enquiries and provider relationships.
Quick summary
Ecommerce payment performance should be measured across the whole payment journey, not from one headline success rate.
- Payment success rate shows how many attempted payments ultimately complete successfully.
- Authorisation rate measures how many card-payment requests sent for authorisation are approved.
- Decline rate and decline reasons help identify where legitimate payments may be failing and whether failures are caused by issuers, authentication, fraud controls or technical issues.
- Checkout-to-payment conversion helps identify whether customers are dropping out before completing payment.
- 3D Secure and authentication performance should be monitored separately because authentication can influence both fraud protection and successful payment completion.
- Subscription businesses should track failed-payment recovery, not just the number of initial recurring-payment failures.
- Disputes, refunds and fraud provide different signals and should not be treated as the same KPI.
- Payment cost should be measured against successful revenue, rather than comparing providers only on an advertised transaction percentage.
- Performance should be segmented. Country, currency, card type, device, payment method, provider and customer type can reveal problems hidden by an overall average.
Merchant Advice Service is an independent UK payments information, comparison and provider-matching service. MAS considers payment performance alongside provider suitability, integrations, acquiring, gateways and commercial costs when helping businesses understand their wider payment setup.
What are ecommerce payment KPIs?
Ecommerce payment KPIs are measurements used to understand how effectively a business converts payment attempts into successful revenue.
They can help identify problems involving:
- issuer declines
- checkout friction
- 3D Secure and authentication
- fraud controls
- recurring-payment failures
- payment-method performance
- international transactions
- technical availability
- refunds and disputes
- settlement
- payment-processing costs.
The useful part is not simply producing a dashboard full of percentages. It is understanding where in the payment journey revenue is being lost and whether the issue can realistically be improved.
The ecommerce payment KPIs worth tracking
| KPI | What it tells you | Useful segmentation |
|---|---|---|
| Payment success rate | How many payment attempts ultimately complete successfully. | Provider, payment method, country, currency, device. |
| Authorisation rate | How many card authorisation requests are approved by issuers. | Issuer country, card type, acquirer, transaction type. |
| Decline rate | How often attempted card payments are declined. | Decline reason, issuer, geography, card type. |
| Checkout-to-paid conversion | How many customers reaching payment actually complete an order. | Device, browser, checkout version, payment method. |
| Authentication performance | How authentication such as 3D Secure affects successful payments. | Issuer, country, device, challenged vs frictionless. |
| Recurring-payment recovery | How many initially failed subscription payments are later recovered. | Decline reason, retry attempt, payment method. |
| Dispute rate | The level of transactions being formally disputed. | Product, country, payment method, dispute reason. |
| Refund rate | The proportion of orders or payment value returned to customers. | Product, market, reason, value. |
| Cost per successful payment | The payment cost required to generate a successful transaction. | Provider, payment method, geography. |
| Settlement performance | How quickly successful payments become available to the business. | Provider, currency, market. |
1. Payment success rate
Payment success rate measures how many payment attempts ultimately result in successful payment.
A simple calculation is:
Successful payments ÷ payment attempts × 100
However, the definition of a “payment attempt” matters.
For example, should multiple retries of the same customer's card be counted as separate attempts? Should payments blocked by fraud controls be included? Should an authentication failure count in the same denominator as an issuer decline?
Businesses should define the metric consistently before comparing one period or provider against another.
This is also why payment success rate and authorisation rate are not necessarily the same thing.
2. Card authorisation rate
Authorisation rate measures how many card-payment requests sent into the card-payment network receive approval from the issuing side.
A simplified formula is:
Authorised card payments ÷ card authorisation attempts × 100
Authorisation performance is particularly important for ecommerce businesses because a declined legitimate transaction can represent revenue that the customer was willing to spend but the payment system failed to convert.
However, not every decline represents a payment problem.
An issuer may legitimately decline a card because of:
- insufficient funds
- card restrictions
- incorrect card details
- suspected fraud
- authentication requirements
- other issuer decisions.
That means an authorisation rate should be investigated rather than simply pushed upwards regardless of risk.
Payment-provider reporting can help businesses analyse authorisation performance and why payments are failing. Stripe, for example, separates payment success rate and network authorisation rate within its current acceptance analytics.
Merchant Advice Service view
An overall authorisation rate can hide more than it reveals.
A business might have an acceptable headline figure while performing badly for European cards, a particular issuer, mobile customers or one payment method.
Merchant Advice Service recommends looking at the segments underneath the headline rate before deciding that a payment provider or gateway is performing well or badly.
A change in authorisation performance should also be assessed alongside fraud, disputes and customer mix. Improving one metric at the expense of another does not necessarily improve the overall commercial outcome.
3. Transaction decline rate
Decline rate measures how often attempted card payments are declined.
A simplified formula is:
Declined card payments ÷ relevant card attempts × 100
Do not stop at the percentage.
The more useful exercise is separating decline reasons.
Payment failures can come from different stages of the payment journey, including:
- issuer declines
- fraud or risk blocks
- authentication failures
- invalid payment information
- technical or API errors.
Those problems need different solutions.
For example, an insufficient-funds decline should not be treated in the same way as an authentication error or a payment blocked by an overly restrictive fraud rule.
Modern payment platforms can return decline codes and other information that help businesses distinguish between failure types.
4. Decline reasons
I would treat decline reasons as a KPI category in their own right.
Instead of reporting:
“Our decline rate was 8%.”
try to understand what sits underneath it:
- What percentage were insufficient funds?
- What percentage required authentication?
- How many contained incorrect card information?
- How many were generic issuer declines?
- How many were blocked by your own fraud controls?
- How many were technical failures?
This makes it much easier to identify where action could realistically improve conversion.
5. Checkout-to-paid conversion
Payment performance does not start when the authorisation request reaches the issuer.
A customer may abandon the purchase before a payment is ever attempted.
One useful ecommerce measurement is therefore:
Successful paid orders ÷ customers reaching the payment stage × 100
This can highlight issues including:
- checkout complexity
- unexpected delivery costs
- missing payment methods
- poor mobile experience
- authentication friction
- technical errors
- slow pages
- customer confidence.
Be careful about labelling every checkout abandonment as a payment failure. The reason may sit elsewhere in the ecommerce journey.
6. 3D Secure and authentication performance
Strong Customer Authentication affects many electronic payments in the UK, subject to the applicable rules and exemptions.
For ecommerce businesses using 3D Secure, useful metrics can include:
- payments entering authentication
- successful authentication
- authentication failures
- customer abandonment during authentication
- transactions receiving a frictionless authentication flow
- transactions requiring a customer challenge
- authorisation performance after authentication.
Authentication should not be viewed purely as an obstacle to conversion.
It is part of the wider security and regulatory framework around electronic payments. The useful question is whether authentication is being handled correctly and whether unnecessary friction or technical failures are occurring.
The Financial Conduct Authority states that Strong Customer Authentication requirements affect electronic payment transactions, subject to relevant exemptions.
7. Subscription payment failure rate
Recurring-payment businesses need a different set of measurements from businesses that only take one-off payments.
Useful subscription KPIs include:
- successful first payments
- successful renewal payments
- initial recurring-payment failures
- soft versus hard declines where available
- recovered failed payments
- customers requiring an updated payment method
- customers lost following payment failure.
Simply measuring the first failure rate can make subscription performance look worse than it ultimately is.
Some failures are recoverable through retry logic, updated payment details or customer communication.
8. Failed-payment recovery rate
For a recurring business, consider measuring:
Recovered failed payments ÷ recoverable failed payments × 100
The exact denominator should be defined carefully because some hard declines should not simply be retried repeatedly.
Modern billing platforms can use scheduled or automated retry strategies for recoverable subscription-payment failures.
For example, Stripe's current Billing documentation distinguishes between recoverable failures and hard declines and supports both automated and custom retry schedules.
Read our Subscription Payment Processing guide for a wider look at recurring payments.
9. Dispute and chargeback rate
Disputes should be monitored alongside payment acceptance rather than treated as a separate operational problem.
You can measure disputes by transaction count:
Disputed transactions ÷ relevant transactions × 100
and by value:
Value disputed ÷ relevant payment value × 100
Both can be useful.
A business processing a small number of very high-value transactions can produce a different risk picture from one processing thousands of low-value orders.
Also analyse dispute reasons.
Potential causes can include:
- fraud
- customer recognition issues
- delivery problems
- subscription cancellation problems
- refund disputes
- product or service dissatisfaction.
Card schemes and payment providers can operate monitoring programmes and thresholds that change over time, so businesses approaching concerning dispute levels should confirm the current requirements that apply to their specific provider and card-scheme arrangement.
10. Refund rate
Refund rate should be measured separately from disputes.
Useful calculations include:
Number of refunded orders ÷ total paid orders × 100
and:
Refunded value ÷ total successful payment value × 100
A high refund rate does not automatically mean the payment provider is performing poorly.
It can indicate issues elsewhere, including:
- product returns
- delivery
- cancellations
- customer expectations
- duplicate transactions
- business-specific refund policies.
For sectors such as travel, events and future-delivery businesses, refund behaviour can also be highly seasonal or event-driven.
11. Cost per successful payment
One of the most useful commercial KPIs is not simply the transaction fee.
It is:
Total relevant payment-processing cost ÷ successful payments
This forces the business to consider costs such as:
- transaction charges
- gateway charges
- authorisation fees
- international fees
- FX costs
- fixed account costs
- other relevant processing charges.
It can be particularly useful when comparing payment methods or providers.
A payment method with a higher nominal transaction cost may still produce a strong commercial outcome if it converts more customers or performs better in a particular market.
12. Effective payment cost rate
Higher-volume businesses may also want to monitor payment costs as a percentage of processed value:
Total relevant payment-processing costs ÷ successful payment value × 100
This can be more informative than looking at a provider's advertised transaction percentage because the actual payment bill may contain multiple fixed and variable charges.
Read our guide to UK interchange fees, blended pricing and IC++.
13. Settlement performance
Payment success and settlement are different stages.
A transaction can be successfully authorised and captured while the business still waits for the resulting funds to be settled.
Useful settlement KPIs can include:
- average time to settlement
- percentage settled within the expected period
- settlement delays
- funds held or reserved
- performance by currency
- performance by acquiring entity.
For businesses with significant stock, advertising, payroll or supplier costs, settlement performance can have a direct cash-flow impact.
14. Payment-method performance
Do not assume all payment methods perform equally.
Compare:
- cards
- digital wallets
- bank-payment methods
- local payment methods
- other alternative payment methods relevant to your customers.
For each method, consider:
- conversion
- success rate
- average order value
- cost
- refunds
- disputes
- customer geography.
A payment method that performs extremely well in one market may be far less relevant elsewhere.
15. International payment performance
Businesses selling internationally should segment payment KPIs by geography.
Useful breakdowns include:
- customer country
- card-issuer country
- currency
- acquiring location
- payment method
- provider or acquirer.
An overall authorisation rate can hide a weak-performing market.
For example, UK cards may perform strongly while customers in another country experience materially more declines.
That can raise questions about:
- local acquiring
- cross-border processing
- payment methods
- authentication
- issuer behaviour
- the payment-provider setup.
Read our Foreign Currency and Multi-Currency Merchant Accounts guide.
16. Payment gateway availability and technical errors
Businesses should also monitor whether the payment technology itself is available when customers need it.
Useful measurements can include:
- gateway downtime
- API error rates
- checkout errors
- payment-method errors
- unusual latency
- sudden changes in authorisation performance.
These are particularly important because a technical failure can look like a commercial or customer problem if the business does not separate the different stages of the payment journey.
Some payment platforms provide alerts where payment performance suddenly changes. Stripe, for example, currently provides health alerts covering areas including authorisation-rate anomalies, payment-method errors and API latency.
What is a good ecommerce payment success rate?
There is no single payment-success percentage that should automatically be treated as “good” for every ecommerce business.
Performance can vary according to:
- country
- customer type
- card mix
- payment method
- transaction value
- subscription versus one-off payments
- fraud controls
- authentication
- provider
- acquiring setup.
A better starting point is to establish your own reliable baseline and monitor how performance changes over time.
Then compare relevant segments rather than relying on a generic internet benchmark.
For example:
- Did authorisation improve after changing acquirer?
- Are mobile customers performing worse than desktop?
- Has a particular market deteriorated?
- Are more subscription failures being recovered?
- Has cost per successful transaction increased?
- Has stronger fraud protection reduced disputes but also blocked more legitimate customers?
How should ecommerce payment KPIs be segmented?
At minimum, consider whether you can segment your payment data by:
- payment provider
- acquirer
- gateway
- payment method
- card type
- issuer country
- customer country
- currency
- device
- browser
- subscription versus one-off
- new versus returning customer
- transaction value.
You do not necessarily need every segmentation from day one.
Start with the areas most commercially important to the business and investigate anomalies as they appear.
How often should payment KPIs be reviewed?
The right frequency depends on transaction volume.
A high-volume ecommerce business may need near-real-time monitoring for technical and authorisation anomalies, while a smaller merchant may obtain enough information from weekly or monthly reviews.
A practical model is:
- Real time: outages, technical failures and major performance anomalies.
- Daily or weekly: authorisation, declines, authentication and payment-method performance for larger merchants.
- Monthly: cost, disputes, refunds, settlement and provider comparison.
- Quarterly: wider strategic review of whether the payment setup still fits the business.
Common mistakes when measuring payment performance
Looking only at the overall success rate
A single percentage can hide weak markets, issuers or payment methods.
Counting every retry as a completely new customer failure
This can distort decline and success data. Keep the measurement methodology consistent.
Assuming every decline is preventable
Some declines are legitimate issuer decisions and should not simply be retried indefinitely.
Optimising acceptance without monitoring fraud
A higher authorisation rate is not automatically positive if dispute and fraud losses also increase.
Using a universal benchmark
Your customer and transaction mix may be very different from the business that produced the benchmark.
Comparing provider rates without comparing outcomes
A slightly cheaper provider that converts fewer legitimate payments may not produce the lowest real payment cost.
When might payment KPIs indicate you should review your provider?
One poor week does not necessarily mean you need a new payment provider.
But a wider review may be worthwhile where you repeatedly see:
- weak authorisation performance in strategically important markets
- technical limitations that restrict checkout improvements
- poor international performance
- limited subscription-recovery functionality
- uncompetitive total processing costs
- settlement that no longer fits the business
- poor integration with your ecommerce platform
- lack of reporting required to understand payment performance
- the business outgrowing the original payment setup.
The first step should be identifying the actual problem rather than assuming switching provider will automatically solve it.
Read our Switching Merchant Provider guide.
Merchant Advice Service view: measure payments as revenue infrastructure
For a growing ecommerce business, payments should not be treated simply as a cost centre.
The payment stack affects whether customer demand turns into collected revenue.
Merchant Advice Service recommends looking at three questions together:
- Can customers successfully pay?
- What does each successful payment actually cost?
- Is the payment infrastructure still suitable for the way the business is growing?
That creates a more useful conversation than simply asking whether the current provider's transaction rate is competitive.
Related ecommerce payment guides
- Ecommerce Payment Providers UK — how to compare gateways, acquiring and PSPs for online businesses.
- How Enterprise Merchants Improve Payment Authorisation Rates — a deeper look at improving card acceptance.
- Subscription Payment Processing — recurring payments, retries and billing infrastructure.
- Changing Payment Gateway — migration, tokens and recurring payments.
- Compare UK Payment Providers — compare providers according to the requirements of the business.
About Merchant Advice Service
Merchant Advice Service is a UK business-to-business payments information, comparison and provider-matching service.
Founded in 2016, MAS helps businesses understand their payment requirements and identify payment providers or specialist partners that may be relevant to the way they operate.
We provide information and support across areas including:
- merchant accounts
- payment gateways
- ecommerce payments
- integrated payments
- higher-risk merchant accounts
- international acquiring
- multiple currencies
- subscription and recurring payments
- specialist payment integrations
- merchant finance
- more complex provider requirements.
Merchant Advice Service is not an acquiring bank, lender or payment processor and does not make final underwriting decisions.
The MAS information, matching and introduction service is free to businesses. MAS may receive commission or a referral fee from some commercial partners where an introduction results in a completed product or account.
For full information about how our service operates, provider matching, independence and commercial relationships, read How Merchant Advice Service Works.
Sources and further reading
- Stripe — Payments analytics
- Stripe — Acceptance analytics
- Stripe — Payment declines
- Stripe — Subscription payment retries
- Financial Conduct Authority — Strong Customer Authentication
Editorial and commercial disclosure
Merchant Advice Service is an independent payments information, comparison and provider-matching service.
Our editorial content may reference payment providers, technology companies and financial institutions regardless of whether Merchant Advice Service has a commercial relationship with them.
Where providers are named for comparison, research or technical examples, inclusion does not constitute a recommendation and should not be taken to mean that Merchant Advice Service can introduce businesses to that provider.
MAS may receive commission or a referral fee from some commercial partners where a business chooses to proceed following an introduction. Commercial relationships do not determine which providers may be referenced within our independent educational content.
Providers have not paid for inclusion in this article unless explicitly stated.
Provider capabilities, pricing, integrations and acceptance criteria can change. Businesses should confirm current information directly with the relevant provider before making a decision.
FAQs
What are the most important ecommerce payment KPIs?
The most useful KPIs usually include payment success rate, card authorisation rate, decline rate and decline reasons, checkout-to-payment conversion, authentication performance, disputes, refunds, payment costs and settlement. Subscription businesses should also monitor failed-payment recovery.
What is the difference between payment success rate and authorisation rate?
Authorisation rate usually measures whether card authorisation requests sent to the card network are approved by issuers. Payment success rate can cover the wider payment journey and may include failures occurring before or after authorisation. Businesses should define the denominator consistently before comparing performance.
What is a good ecommerce payment success rate?
There is no universal percentage that is appropriate for every ecommerce business. Performance varies by geography, card mix, payment method, transaction type, fraud controls, authentication and acquiring setup. Establishing your own baseline and comparing relevant segments is usually more useful than relying on a generic benchmark.
Why do ecommerce payments get declined?
Payments can fail because of issuer declines, insufficient funds, incorrect payment information, authentication requirements, fraud controls, card restrictions or technical errors. Payment providers can return decline codes and other information that help merchants understand the cause.
How can I improve my ecommerce authorisation rate?
Start by analysing where and why payments are failing. Compare performance by issuer, customer country, card type, payment method and acquirer, and distinguish issuer declines from authentication, fraud-control and technical failures. Payment analytics platforms increasingly provide this segmentation.
Should I retry every declined payment?
No. Some failures can be retried, while others should not be repeatedly resubmitted. Payment providers can return decline or advice codes indicating different next steps, and card networks can limit retries.
What payment KPIs should a subscription business track?
Subscription businesses should monitor first-payment success, renewal success, failed renewals, decline reasons, recovered failed payments, payment-method updates and customers lost because payments could not be recovered. Automated retry systems can recover some failed subscription payments.
How does 3D Secure affect payment performance?
3D Secure can affect authentication, fraud management and successful completion of online card payments. Merchants should monitor authentication success, challenge/abandonment behaviour and subsequent authorisation rather than looking only at overall payment success. UK Strong Customer Authentication rules apply to relevant electronic payments subject to applicable exemptions.
How should I measure the cost of ecommerce payments?
Useful measures include cost per successful payment and payment costs as a percentage of successful payment value. Include relevant transaction, gateway, authorisation, international, FX and fixed service costs rather than comparing only advertised transaction rates.
When should I consider changing ecommerce payment provider?
A review may be worthwhile where the current provider repeatedly performs poorly in important markets, restricts required integrations or payment methods, provides insufficient reporting, has become commercially uncompetitive or no longer supports the way the business operates. A poor KPI by itself does not necessarily mean switching provider is the answer.
Written or reviewed by Libby James, founder of Merchant Advice Service and specialist in merchant payments and complex provider requirements.
