Facebook CAPI for Squarespace: Complete Setup Guide

Squarespace makes it simple to build a professional website and e-commerce store. But if you're running Facebook ads to drive traffic and sales, the standard Facebook Pixel isn't enough anymore.

Ad blockers, iOS 14 privacy changes, and browser restrictions mean you're likely losing 20-40% of your conversion data. That's money left on the table and inaccurate data hurting your ad optimization.

The solution? Facebook Conversions API (CAPI) - server-side tracking that captures conversions your Pixel misses.

This guide walks you through setting up Facebook Conversions API on your Squarespace site, no coding required. New to CAPI? Read our complete guide to Facebook Conversions API first.

Why Squarespace Store Owners Need Facebook Conversions API

If you're selling products on Squarespace and advertising on Facebook, you face a critical problem: incomplete conversion tracking.

Here's what's happening right now:

• iOS 14 blocks tracking. Most iPhone users have opted out of tracking. When they buy from your Squarespace store, Facebook might not know the purchase came from your ad.

• Ad blockers block the Pixel. Safari, Brave, and privacy-focused browsers block the Facebook Pixel by default. Sales from these visitors don't get attributed to your ads.

• Third-party cookies are disappearing. Browsers are eliminating cookie-based tracking. The Pixel depends on cookies. Server-side tracking doesn't.

The impact on your business:

• Facebook can't see which ads are actually driving sales

• Your campaigns optimize on incomplete data

• Your ROAS looks worse than it actually is

• You waste budget on ads that appear not to work

This is why Facebook ads often underreport conversions. Facebook Conversions API solves this by sending purchase data directly from a server to Facebook, completely bypassing browser limitations.

Learn more about the difference between server-side tracking and Pixel.

The result? Accurate conversion tracking, better ad optimization, and more sales.

What You'll Need Before Starting

Before setting up CAPI on your Squarespace site, gather these:

✅ A Squarespace website (any plan, but Business or Commerce plan for full e-commerce)

✅ Facebook Business Manager account

✅ Facebook Pixel already installed on your Squarespace site

✅ Admin access to Squarespace

✅ Access to Facebook Events Manager

Keep your Pixel installed. CAPI and the Pixel work together. Facebook automatically deduplicates events so you never double-count conversions.

Method 1: Set Up CAPI with PixelFlow (Recommended for Squarespace)

The fastest way to add Facebook Conversions API to Squarespace is using PixelFlow - a no-code tool designed specifically for platforms like Squarespace.

Why? Because by installing just one code snippet on your Squarepsace site, PixelFlow automatically captures all key eCommerce events on your Squarespace site including:

• Add to Cart

• Iniatiate Checkout

• Purchase

It also captures PageViews and can capture form submissions too.

Each event includes rich details such as product name, price, quantity, and total order value, all sent directly to Facebook through the Conversion API (CAPI). This means you'll finally get better data flowing to your Facebook ads which means its more easy for Facebook to find you similar customers in your ads.

What's even better is that PixelFlow loads both your Pixel & CAPI together for you to get the most coverage and it automatically handles deduplication so you don't need to worry about extra events showing up in your events manager.

Step 1: Sign Up for PixelFlow

1. Go to PixelFlow.so

2. Click Get Started

3. Create your account

4. Select Squarespace as your platform

Step 2: Enter your website URL

1. Enter your website URL

2. (Optional) Choose a currency for your website if you sell eCommerce products

Step 3: Connect Your Facebook Pixel/Dataset

Next you need to add your Pixel name (this can be anything), Pixel ID (called Dataset ID in Facebook) and create an access token.

1. Go to Facebook Events Manager

2. Select your Pixel/dataset you want to send events to and copy the Dataset ID then paste it into PixelFlow in the "Meta Pixel ID" box

3. In Events Manager, with your dataset selected, click Settings and scroll down to Conversions API

4. Choose "Set up with Dataset Quality API"

5. Click Generate Access Token

5. Copy the access token and paste it into the Conversions API Access Token box in PixelFlow then press Next

Security note: Keep this token private. It gives access to send data to your Pixel.

Step 4: Install PixelFlow on Your Squarespace Site

Now you'll add PixelFlow's tracking script to your Squarespace site:

1. Copy the tracking script provided

2. Open your Squarespace dashboard

3. Click on Website → Pages → Custom Code → Code Injection

4. Paste the script in the Header section (not Footer)

5. Click Save

Important: The script must go in the Header section to ensure it loads before page content.

Your Squarespace site will now send events via both the Pixel and Conversions API using PixelFlow. Its automatically tracking:

• Page View events

• Add to Cart events

• Iniatiate Checkout events

• Purchase events

To track form submissions, you need to follow the next steps.

Triggering a Facebook Event from Form Submissions on Squarespace

Because of the limitations of Squarespace, the simplest way to track a form submission and trigger an event like "Lead" is as follows.

1. Open your Squarespace site and duplicate your contact form page

2. Edit the URL to something like "/thank you" and change the page content to say "Thank you for your message" and save it

3. Go to the page your form is on and click the Edit button

4. Click on Post-Submitand choose Redirect

5. Click Attach Link

6. Choose the URL of your thank you page and press Save

Now your Squarespace form will redirect to a new URL once the user completes the form. This new page should not be linked to from anywhere on your site so the user will only get there if they complete the form.

Next you just add the URL of your thank you page as a "trigger" in your PixelFlow dashboard so when a user completes the form, they'll be redirected to the thank you page and trigger the event.

You can do this in the PixelFlow dashboard by clicking on "Add New" in the Event URLs section and adding the information here:

Testing Your Setup

Before trusting your new tracking, verify it works:

1. Go to Facebook Events Manager

2. Select your Pixel

3. Click Test Events in the left sidebar

4. Switch to Server tab to see CAPI events

5. In a new browser window, visit your Squarespace site

6. Complete a test action:

   • View a product page

   • Add something to cart

   • Complete a test purchase (if possible)

7. Return to Events Manager and check for events marked Server

If you see server events appearing in real-time, your CAPI setup is working correctly.

Pro tip: Test with an ad blocker enabled to confirm CAPI tracks conversions even when the Pixel is blocked.

Monitor Event Match Quality

Event Match Quality (EMQ) determines how well Facebook can match your events to user profiles:

1. In Events Manager, go to Overview

2. Find Event Match Quality in the data quality section

3. Check your score for server events

4. Target Good (7.0+) or Great (8.0+) ratings

Higher EMQ = better attribution and ad optimization.

PixelFlow automatically optimizes EMQ by including customer parameters like email, phone, and name when available from checkout data. Learn more about how Facebook generates Event Match Quality scores.

Method 2: Manual CAPI Setup via Custom Code (Advanced)

If you prefer not to use third-party tools like PixelFlow, you can implement CAPI manually. However, this requires significant technical knowledge.

Requirements:

• Understanding of APIs and HTTP requests

• Server or cloud function setup (Squarespace doesn't provide server-side access)

• Ability to write custom JavaScript

• Knowledge of Squarespace's Commerce APIs

High-Level Process:

1. Set up a server endpoint (AWS Lambda, Google Cloud Functions, Cloudflare Workers)

2. Create custom JavaScript to capture Squarespace Commerce events

3. Send event data to your server endpoint

4. Forward formatted events to Facebook Conversions API

5. Implement deduplication logic

6. Add error handling and monitoring

Reality check: This approach takes days or weeks to implement and requires ongoing maintenance. For most Squarespace users, PixelFlow's no-code solution is faster, more reliable, and easier to maintain.

Troubleshooting Common Squarespace CAPI Issues

Events Not Appearing in Test Events

Problem: You've installed CAPI but don't see server events in Facebook Events Manager.

Solutions:

• Verify the tracking script is in the Header section (not Footer)

• Check that your access token is correct and active

• Confirm you've saved changes in Squarespace Code Injection

• Clear browser cache and test again

• Check PixelFlow dashboard for connection errors

• Wait 5-10 minutes (events can have slight delay)

Purchase Events Missing or Incomplete

Problem: Purchase events fire but don't include transaction value or product details.

Solutions:

• Verify you're on Squarespace Business or Commerce plan (required for full e-commerce data)

• Check that dynamic values are enabled in PixelFlow

• Confirm purchase confirmation page is triggering the event

• Test with a real transaction (test mode can have limited data)

• Check Squarespace Commerce settings are properly configured

Low Event Match Quality Score

Problem: EMQ score is below 7.0 (rated "Poor" or "OK").

Solutions:

• Ensure customer email is captured at checkout

• Enable automatic hashing of customer information

• Include phone numbers if collected during checkout

• Verify IP address and user agent are being sent

• Check that FBC and FBP cookies are included in event data

Conversions Counted Twice

Problem: Same purchase appears to be tracked twice in Facebook reporting.

Solutions:

• Enable event deduplication in PixelFlow settings

• Verify event IDs match between Pixel and CAPI

• Check that event names are identical (case-sensitive: "Purchase" not "purchase")

• Ensure both events fire within 5 seconds of each other

• Review your Squarespace Code Injection for duplicate Pixel code (PixelFlow already loads your Pixel alongside the CAPI)

CAPI Working But Ads Not Improving

Problem: Events track correctly but ad performance hasn't improved.

Solutions:

• Allow 24-48 hours for Facebook's algorithm to incorporate new data

• Verify you're tracking valuable events (purchases, not just page views)

• Check that event values are formatted correctly (numbers, proper currency)

• Ensure you have sufficient conversion volume (50+ per week minimum)

• Review your ad targeting and creative (tracking alone won't fix bad ads)

Squarespace-Specific Best Practices

Use CAPI + Pixel Together, Always

Never disable your Facebook Pixel when adding CAPI. Run both simultaneously for maximum tracking coverage. Facebook's built-in deduplication ensures accurate counting.

Track the Complete Purchase Journey

Don't only track purchases. Track the full path:

PageView → ViewContent → AddToCart → InitiateCheckout → Purchase

This gives Facebook rich optimization signals and better understanding of customer behavior patterns.

Capture Customer Data at Checkout

Squarespace Commerce collects customer emails, names, and phone numbers at checkout. Make sure CAPI includes this data (hashed) for maximum Event Match Quality.

PixelFlow automatically handles this if you enable customer information parameters.

Test After Squarespace Updates

If Squarespace updates your site template or you change themes, test your tracking afterward. Template changes can sometimes affect how events fire.

Monitor Performance Weekly

Check Event Match Quality and total event volume weekly. If you notice drops, investigate immediately - tracking issues compound quickly.

Connect Squarespace to Acuity Scheduling

If you use Acuity Scheduling (owned by Squarespace), track appointment bookings as Lead or Schedule events. This captures high-value conversions for service businesses.

Why PixelFlow is Perfect for Squarespace + CAPI

While several methods exist for implementing Conversions API, PixelFlow is built specifically for no-code platforms like Squarespace:

✅ No coding required - Simple script installation via Code Injection ✅ Automatic Squarespace Commerce integration - Pulls transaction data automatically ✅ Event deduplication built-in - Prevents double-counting ✅ Optimized Event Match Quality - Includes customer parameters automatically ✅ Real-time event testing - Verify tracking instantly ✅ Form submission tracking - Automatically captures Squarespace form fills as Lead events ✅ GDPR & privacy compliant - Respects user consent preferences

For Squarespace users who want bulletproof Facebook ad tracking without technical headaches, PixelFlow is the fastest path to implementation.

Next Steps: Maximize Your Facebook Ad Performance

Congratulations! You've now set up Facebook Conversions API on your Squarespace site. You're tracking conversions more accurately than most advertisers.

But accurate tracking is just the beginning. Here's what to do next:

1. Verify your Event Match Quality is 7.0+ - Higher scores = better optimization

2. Confirm all critical events are tracking - Test purchases, leads, and key actions

3. Monitor conversion volume in Events Manager - You should see 15-30% more conversions within 48 hours

4. Let Facebook re-optimize - Give campaigns 3-7 days to adjust to better data

5. Adjust your bidding strategy - With accurate data, you can be more aggressive

Want to dive deeper? Check out these guides:

• What is Facebook Conversions API? - Foundational knowledge

• Server-Side Tracking vs Pixel - Compare tracking methods

• How Facebook Generates Event Match Quality Scores - Optimize your EMQ

• 7 Meta Events You Should Be Tracking - Event strategy

• Why Facebook Ads Underreport Conversions - Understand attribution issues

• How to Set Up CAPI in Webflow - Webflow setup guide

Ready to set up server-side tracking on your Squarespace store? Get started with PixelFlow and start tracking every conversion in minutes.