Step 1) Add this custom HTML:

<script>

// CustomHTML only trigger on /checkout/sale-complete.html and gtm.dom ready

function createCookie(name,value,days) {

if (days) { // If not provided, it will be a session cookie.

var date = new Date();

date.setTime(date.getTime()+(days*24*60*60*1000));

var expires = “; expires=”+date.toGMTString();

}

else var expires = “”;

document.cookie = name+”=”+value+expires+”; path=/”;

}

 

function readCookie(name) {

var nameEQ = name + “=”;

var ca = document.cookie.split(‘;’);

for(var i=0;i < ca.length;i++) {

var c = ca[i];

while (c.charAt(0)==’ ‘) c = c.substring(1,c.length);

if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);

}

return null;

}

 

if (!readCookie(‘cookie_hasPurchaseRecordedAlready’)) {

createCookie(‘cookie_hasPurchaseRecordedAlready’, ‘true’, 1);

}

</script>

 

Step 2) Create a new first-party-cookie macro called cookie_hasPurchaseRecordedAlready.

Step 3) Create a blocking rule for conversion tracking tag to not fire if cookie_hasPurchaseRecordedAlready=true

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