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The Dash.fi Ad Pay Protection pixel matches user events on your website with data from your ad platforms by reading URL parameters. When a visitor arrives from a Meta or Google ad, the landing page URL needs specific parameters — particularly campaign_id. These let the pixel link the session back to the exact campaign that generated it. Without these parameters, attribution becomes partial or inaccurate, which limits the pixel’s ability to detect fraud and identify overcharges tied to specific campaigns.

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Required parameters

Include the following parameters in every ad destination URL. The more complete your tagging, the more precise your auditing and attribution data will be.
ParameterPurposeExample value
campaign_idMost important. The unique ID assigned by the ad platform. Enables exact campaign matching.123456789
utm_sourceIdentifies the traffic sourcefacebook, google, linkedin
utm_mediumDescribes how traffic was deliveredcpc, social, email
utm_campaignCampaign name for contextual reportingblack_friday_sale
utm_contentDifferentiates ad creatives within a campaignvideo1, headlineA, carousel_ad1
utm_term(Optional) Tracks keywords for search campaignsrunning+shoes
The campaign_id parameter is the most critical. Without it, the pixel cannot perform exact campaign matching, and audit results for that traffic will be incomplete. Always include campaign_id in your ad URLs.

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Example of a well-tagged URL

The URL below includes all required parameters and demonstrates the correct format: 
https://yourwebsite.com/?utm_source=facebook&utm_medium=cpc&utm_campaign=black_friday_sale&utm_content=carousel_ad1&campaign_id=123456789

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How to add campaign_id in Meta Ads

Meta supports dynamic URL parameters that automatically insert the campaign ID into your destination URL at the time your ad serves. Follow these steps to enable it:
1

Open the ad in Ads Manager

In Meta Ads Manager, navigate to the specific ad you want to modify.
2

Find URL Parameters

Scroll down to the URL Parameters section within the ad settings.
3

Open the URL Parameter builder

Click Build a URL Parameter to open the parameter builder tool.
4

Add the campaign_id dynamic parameter

Choose campaign_id from the list of available dynamic parameters. Meta will automatically insert the correct campaign ID value when the ad delivers.
5

Save your changes

Save the ad. From this point on, every landing page URL generated by that ad will include ?campaign_id=12345 (with the actual campaign ID populated dynamically).

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Platform URL templates

Use these templates as starting points when building tagged URLs for your campaigns.
Add this as a URL parameter template in your Meta ad settings. Meta will populate campaign_id dynamically at ad delivery time.
utm_source=facebook&utm_medium=cpc&utm_campaign=summer_launch&campaign_id={{campaign.id}}
Or as a complete destination URL:
https://yourwebsite.com/?utm_source=facebook&utm_medium=cpc&utm_campaign=summer_launch&campaign_id={{campaign.id}}

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Best practices

Platform-assigned campaign IDs are globally unique and auto-assigned. They are the most reliable way for the Ad Pay Protection pixel to perform exact campaign matching. Make campaign_id a standard part of every ad URL template you use.
Inconsistent naming (e.g., Facebook vs. facebook vs. fb) fragments your data and makes reporting less reliable. Establish naming conventions for utm_source, utm_medium, and utm_campaign and apply them uniformly across all campaigns.
Leverage platform-native dynamic parameter tools (like Meta’s URL Parameter builder or Google’s ValueTrack parameters) wherever possible. These automatically populate the correct values and eliminate manual errors.
Before activating any campaign, click through your ad’s destination URL and inspect the full URL in your browser’s address bar. Confirm that all parameters — especially campaign_id — are present and correctly formatted.