Hey Alex,

as long as you send an event or webhook to CIO in case the user logs in, you can do the following:

Create a campaign and simple add “create or update a person” in the workflow. There you can select your attribute number_of_page_views and use liquid to increase the value by 1 with the filter “plus” (in my case it named the attribute page_views):

Hope that helps,

Felix

Hey, Felix!
i did according to your advice.
It works fine if person has number_of_page_views attribute, but in case it does not have it,  there is an error. 
In case attribute number_of_page_views does not exist yet, we would like it to be created and incremented.
Can you please give an advice how we could fix this ?
Here are the screenshots of my current configuration,
Thanks in advance!
 

@Felix this worked for me:

{% if customer.number_of_page_views != blank %}
  {{customer.number_of_page_views | plus: 1 }}
{% else %}
  {{ 1 }}
{% endif %}

@alex_mustafa That would have been my solution as well. I think you don’t need the brackets before and after 1, but as long as it works you are good to go :)

Best,
Felix