Anti-Fraud Playbook

GA4 Traffic Fraud & Cart Abandonment Audit Playbook

Learn how to detect bot networks, clean ad traffic, and analyze shopping cart conversion leaks using GA4 session dimensions.

For Shopify store owners, traffic quality is everything. Paying for invalid ad clicks (click farms, scraping robots) drains your budget, while checkout leaks spoil genuine conversions. This playbook details how to use GA4 session dimensions to perform a traffic audit.

1. Detecting Fake Traffic & Bots

Fake clicks and web spiders hide behind standard CPC sources. Filter them out using these dimension recipes in GA4 Exploration reports:

#01The Screen Resolution Check

Dimensions: Session source/medium + Screen resolution

Bot traffic often operates in headless browser windows that report default resolutions like '800x600', '0x0', or have a 100% bounce rate. If a specific paid campaign has more than 20% traffic from '0x0' or '800x600', pause that ad set immediately.

#02The Datacenter / Cloud ISP Filter

Dimensions: Session source/medium + ISP / Network domain

Real shoppers use residential ISPs (Comcast, Verizon, China Unicom). Bots run on cloud servers (Amazon AWS, Google Cloud, DigitalOcean). If you spot high CPC session counts originating from data centers, you are paying for scraper bots.

#03Engaged Sessions & Duration Outliers

Dimensions: Session source/medium + Average session duration

Real interest takes time. Traffic with an average engagement time of '< 1s' and 0% 'Engaged sessions' is 99% fraudulent. Ad networks are running autoplay background banner impressions instead of real user clicks.

2. E-commerce Cart Leak Audit

Analyze where users drop out during checkout to identify payments, shipping, or technical errors:

Add To Cart -> Begin CheckoutHigh drop-off rate (Typical: > 60% drop-off)

Audit Focus:Audit shipping fees and return policies. Displaying high shipping costs *after* adding to cart is the #1 conversion killer. Offer free shipping thresholds to motivate checkout.

Begin Checkout -> PurchaseSudden conversion drop (Typical: > 50% drop-off)

Audit Focus:Verify Shopify Payment Gateway. Run test orders to ensure credit card/Paypal fields load within 1.5 seconds. Check if foreign cards or local payment methods (Alipay, Ideal, Klarna) are properly set up.

Traffic Quality Audit Checklist

✓Exclude all known bot traffic in GA4 Admin Settings.
✓Set up IP exclusion in Google Ads & Meta Ads Manager for malicious subnets.
✓Deploy a Shopify Web Pixel to verify that 'purchase' triggers match actual order counts.
✓Monitor checkout-step loading speeds using Shopify Speed Index metrics.