r/prestashop

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Hi everyone,

I have a tracking problem with Prestashop and the Redsys payment gateway.

The issue is:

When a customer comes from a Google Ads campaign and completes the payment through Redsys, the order is correctly created in Prestashop and the payment is successfully processed.

However, Google Ads and sometimes GA4 do not register the conversion.

After investigating, it seems that Redsys does not always return the user to the proper Prestashop order confirmation page (order-confirmation), or the original tracking/session information is lost during the external payment process.

As a result:

Orders exist in Prestashop

Payments are successful

But Google Ads conversions are missing

GA4 attribution is sometimes lost or appears as Direct traffic

Current setup:

Prestashop

Redsys payment module

Google Ads

Google Analytics 4

Google Tag Manager

I suspect:

loss of GCLID/session attribution,

broken return URL flow,

or conversion tags depending only on thank-you page views.

Has anyone solved this properly?

Would you recommend:

server-side tracking,

enhanced conversions,

custom GTM events,

modifying Redsys return URLs,

or triggering conversions directly from backend order validation?

Any advice or proven setup would be greatly appreciated.