Spiffy Integration
Spiffy integration is very easy.
As long as you can pass UTMs to the checkout URL, Spiffy can take them and record automatically as it is explained here https://help.spiffy.co/article/251-adding-utm-parameters.
So how can you append all the UTM variables to checkout URL.
It is very easy, simply create your anchor link and add utm-out
class variable.
<a href="https://domain.spiffy.co/checkout/test" class="utm-out" />