GapFill Help

Getting started

Setup takes about five minutes. After that GapFill only records what it would send, and nothing goes to GA4 until you approve.

Before you start

• Your store already sends purchases to GA4
  Through the Google & YouTube app, Google Tag Manager or theme code. GapFill fills the gaps; it does not replace your GA4 tag.
• A Google account with Editor access to the GA4 property
  Viewer access is enough to see the report. Approving sending creates a Measurement Protocol secret, which needs Editor.
• At least 20 purchases in GA4 in the last 30 days
  GapFill learns from your real GA4 data how your tag sends transaction IDs and values.

1. Connect Google Analytics1 min

   Open GapFill from Apps in your Shopify admin. The setup guide on Home shows the next step. Click Connect with Google and sign in.

   Setup guide

   Four steps to find the purchases GA4 missed and send them.

   0 of 4 steps completed

   Connect Google Analytics

   Sign in with a Google account that has Editor access to your GA4 property. GapFill reads purchase data and, after you approve, creates a Measurement Protocol secret.

   Connect with Google

   Choose your GA4 property

   Start the paid plan

   Check the dry run and approve sending

   What GapFill does with this access

   It reads purchase data from GA4. It writes one thing only: when you approve sending, it creates one Measurement Protocol secret. It changes nothing else in your GA4 settings.

2. Choose your GA4 property1 min

   Choose the property your store’s tag sends to, and click Use this property. GapFill starts building the missing purchases report right away.

   Setup guide

   1 of 4 steps completed

   Connect Google Analytics

   Choose your GA4 property

   Choose the property your store’s GA4 tag sends to. The missing purchases report appears right after.

   GA4 property

   My Store – GA4 (345678901)▾

   Use this property

   Start the paid plan

   Check the dry run and approve sending

   If you have several properties

   Pick the one whose Measurement ID (it starts with G-) is the ID in your store’s tag. With the wrong property, orders and GA4 purchases don’t match and the report can’t be built.

3. Check the missing purchases reportFree

   The report shows how many of the last 30 days’ orders are not tracked as purchases in GA4, and how much revenue that is. Shopify orders are on the left, and how GA4 covers them is on the right. Everything on the right that isn’t blue is what GA4 is missing today.

   Missing purchases report

   Last 30 days (2026-09-03 to 2026-10-03) · updated Oct 5, 9:12 AM

   Of 1,240 orders, not tracked as purchases in GA4: 172 (13.9%) / $18,430

   Shopify

   Orders1,240

   GA4

   Tracked by your GA4 tag1,068 (86.1%)

   To be sent by GapFill158 (12.7%)

   Still missing14 (1.1%)

   Everything up to here is free. See how large the gap is in your own store before you decide to go further.

4. Start the paid plan (starts with a dry run)14-day free trial

   Sending to GA4 needs the Standard plan ($19 per month, with a 14-day free trial). Start it from the setup guide or from Billing, and Shopify shows the approval page.

   Nothing is sent to GA4 until you approve. Every hour GapFill only records the orders it would send. Open History to check each order, its amount, and why it would be sent or skipped.

   Status

   Dry run

   Nothing is sent to GA4 yet. GapFill records what it would send so you can check it first.

   Missing from GA413.9% 172 of 1,240 orders

   Would be sent (30 days)158

   Revenue to be sent (30 days)$16,920

5. Review the results and approve sendingWhenever you are ready

   Once the first check has finished (within an hour), an Approve sending section appears on Home. You can approve at any time, though we recommend watching the planned sends for a few days first. Then check both boxes and click Start sending.

   Approve sending

   Based on the dry run so far, about 5 purchases per day will be sent

   After you approve, orders GA4 didn’t track are sent every hour. Review the planned sends

   I understand that data sent to GA4 can’t be deleted or undone later.

   I have given buyers the required notice and obtained consent for collecting and using their data. (This also completes GA4’s user data collection acknowledgement.)

   Start sending

   Before you approve

   Data sent to GA4 can’t be deleted or undone later. Use the dry run to make sure the orders and amounts look right first.

   From then on, GapFill checks every hour and sends orders that GA4 still hasn’t tracked 26 hours after they were placed. Orders older than 70 hours are not sent.

After setup