Python Program

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Prevent Wrong Orders

Cart Validation

Automatically verify every product against your customer’s vehicle specs before checkout. Catch fitment errors, suggest correct alternatives, and eliminate returns before they happen.

-68%

Fitment Returns

+12%

Conversion Rate

<100ms

Check Time

Shopping Cart

2019 VW Golf GTI

Rotiform RSE 19" × 4

5×100 • ET35 • 8.5J • Matte Black

Won’t Fit

Wrong PCD: Your Golf GTI requires 5×112. These wheels are 5×100 and won’t bolt on.

Swap to Rotiform RSE 5×112

Michelin PS4S 235/35 R19 × 4

91Y XL • Summer • Fits 19×8.5 wheels

Verified

Verified for 2019 Golf GTI

THE HIDDEN COST

Wrong Wheels Cost You Real Money

Every fitment return drains your profit margin. Shipping, restocking, support time—it all adds up. Most are completely preventable.

23%

Of wheel orders returned due to fitment

£47

Average cost per return processed

72%

Won’t buy again after bad experience

3hrs

Staff time spent per return

Return Request #R-4821

Fitment Issue

CUSTOMER NOTE

“Wheels don’t fit my car. The holes don’t line up.”

Return shipping (customer or you)

-£24.00

Restocking & inspection time

-£15.00

Customer service handling

-£8.00

Total loss per fitment return

-£47.00

HOW IT WORKS

Catch Errors Before Checkout

Cart Validation runs automatically every time products are added or checkout begins.

Customer Selects Vehicle

Reg lookup or make/model selector captures their exact specs

Products Added to Cart

Customer browses and adds wheels, tyres, or accessories

Instant Validation

We check PCD, offset, bore, tyre size in under 100ms

Swap or Confirm

Errors flagged with 1-click swaps. Verified items proceed

FEATURES

Smart Validation

More than a simple check—Cart Validation guides customers to the right products.

Real-Time Fitment Check

Every product validated against vehicle data instantly. PCD, offset, centre bore, tyre size—all verified before checkout.

1-Click Product Swaps

When a product doesn’t fit, show the correct alternative instantly. Customers swap with one click—no searching required.

Clear Error Messages

Plain English explanations—not error codes. “Wrong PCD: needs 5×112” is understandable. Customers know exactly what’s wrong.

Checkout Blocking

Optionally prevent checkout until errors are resolved. No more “I’ll hope it fits” purchases that become returns.

Validation Analytics

See which products cause the most errors. Track swap acceptance rates. Data to improve your catalogue and descriptions.

Mobile Optimised

Works perfectly on mobile carts where 60%+ of traffic happens. Clear UI, easy swaps, fast validation on any device.

RESULTS

Fewer Returns, More Sales

Cart Validation doesn’t just prevent errors—it increases confidence. Customers who see “Verified for your vehicle” are more likely to complete checkout.

Slash Return Rates

Fitment-related returns drop by 60-70% on average.

Boost Conversion

Verification badges increase buyer confidence significantly.

Happier Customers

Products that fit first time = 5-star reviews.

AVERAGE RESULTS AFTER 90 DAYS

-68%

Fitment Returns

+12%

Conversion Rate

87%

Swap Acceptance

£2.8k

Monthly Savings

<!-- Add before </body> -->

<script
  src="https://cdn.ma/validation.js"
  data-shop="your-shop-id"
  async
></script>

<!-- Done. We handle everything else. -->

INTEGRATION

One Script, Any Platform

Add Cart Validation to your store in minutes. One line of code connects to our fitment database and starts validating immediately.

WooCommerce

Shopify

Magento

Custom Builds

No server-side changes required

Automatically matches your cart styling

Works with existing plugins

GDPR compliant—no personal data stored

Stop Returns Before They Happen

Add Cart Validation to your store and start saving on returns today. Setup takes minutes, results start immediately.

Python Program

Cart Validation

-68%

+12%

<100ms

Shopping Cart

Rotiform RSE 19" × 4

Michelin PS4S 235/35 R19 × 4

Wrong Wheels Cost You Real Money

23%

£47

72%

3hrs

Return Request #R-4821

-£47.00

Catch Errors Before Checkout

Customer Selects Vehicle

Products Added to Cart

Instant Validation

Swap or Confirm

Smart Validation

Real-Time Fitment Check

1-Click Product Swaps

Clear Error Messages

Checkout Blocking

Validation Analytics

Mobile Optimised

Fewer Returns, More Sales

Slash Return Rates

Boost Conversion

Happier Customers

-68%

+12%

87%

£2.8k

One Script, Any Platform

Stop Returns Before They Happen

Quick Link

Fitmentr

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