Get the querystring values with liquid in shopify

shopify-query-string

{%- capture contentForQuerystring -%}{{ content_for_header }}{%- endcapture -%}

{% comment %} Use string splitting to pull the value from content_for_header and apply some string clean up {% endcomment %}
{%- assign pageUrl = contentForQuerystring | split:'"pageurl":"' | last | split:'"' | first | split:'.myshopify.com' | last |
   replace:'\/','/' | 
   replace:'%20',' ' | 
   replace:'\u0026','&'
-%}

{%- assign pageQuerystring = pageUrl | split:'?' | last -%}


{%- if pageQuerystring contains "18460587851873" -%}
  {% include 'cart-add-on' %}
{%- endif -%}

👍 Good to know.