OpenCart: fix eCommerce analytics (GA4 + GTM) — not all purchases/value are being captured

Web Programming — incorrectly specified categories?

270 USD

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Website on OpenCart. In GA4, purchases and/or value are occasionally not recorded. In GTM Preview everything is fine — so the problem is likely with the website/dataLayer (template, modules, cache, asynchronous issues). It is necessary to stabilize tracking to switch to the strategy Maximize Conversion Value/ROAS.

What needs to be done

Audit GA4 + GTM + website, check dataLayer at the steps: view_item, add_to_cart, begin_checkout, purchase.
Align dataLayer push and tags: transmit transaction_id, value, currency, items[]; protect against duplicate purchase.
Check currency/discounts/shipping, price format (dot/comma), module conflicts (OCMOD/VQMOD), cache/CDN, consent banners.
Write tests and conduct a reconciliation of GA4 with the OpenCart admin panel for the test period.

Result (acceptance criteria)

100% of real orders are recorded in GA4 as purchase; discrepancy with the admin panel ≤5%.
Correct: unique transaction_id, value (±1–3%), currency, complete list of products.
Brief documentation: what has been changed, dataLayer schema, GTM triggers, test checklist.
Recommendations for transitioning to Maximize Conversion Value/ROAS. (Optionally separately: Meta CAPI, integration with CRM/CPA).

Access/Data

GA4/GTM/Google Ads, Meta BM/Events. Backup is mandatory; preferably staging or an agreed "window" for work.
OpenCart admin panel, SFTP/Git - I cannot provide these accesses as agreed with our developers, so you need to identify the error and provide a technical task for them.

Requirements for the specialist

Experience with GA4 eCommerce + GTM specifically on OpenCart; ability to find "floating" failures; understanding of currency/VAT/shipping. A plus: Meta CAPI, server-side tagging.

Website: https://attributetime.ua/

Proposals 5 Discussions 1

Anton Y.

337 0

Budget: 9870 UAH Deadline: 5 days

Hello, Ocman!

I have 14 years of experience in developing online stores on OpenCart and have a deep understanding of the nuances of GA4 and GTM. I will be able to stabilize tracking: I will conduct an audit, optimize the dataLayer, and fix module conflicts. My goal is to ensure 100% accuracy of purchases in GA4 and reduce discrepancies with the admin panel. I will provide you with clear documentation and recommendations for transitioning to Maximize Conversion Value. I guarantee quality!

I look forward to your response!