Non-unique hostnames 
Suppose you redirect your visitors to a payment provider, and after they complete the payment, they return to your website. Because of the nature of not tracking visitors in Simple Analytics, we count those “returning” visitors as new visitors. To prevent this from happening, you can specify the hostname of that payment provider to tell us we should register this visit as non-unique.
You can specify a list of hostnames (without https://) in the data-non-unique-hostnames setting of our embed script:
<script
data-non-unique-hostnames="checkout.stripe.com"
src="https://scripts.simpleanalyticscdn.com/latest.js"
></script>
In the above example, visitors coming from checkout.stripe.com will be counted a non-unique.
Multiple non-unique hostnames
You can separate hostnames with a comma. For example:
<script
data-non-unique-hostnames="checkout.stripe.com,checkout.adyen.com,checkout.mollie.com"
src="https://scripts.simpleanalyticscdn.com/latest.js"
></script>