Using the sample code below, you can display custom html, javascript, etc. based on any criteria. For example, set parameter as false if specific product category is found:
{% if context == 'receipt' %} {% set candy = true %} {% for item in items %} {% if item.category == 'WHOLESALE' %} {% set categoryFound = false %} {% endif %} {% endfor %} {% if categoryFound %} <h1>Success!</h1> {% endif %} {% endif %}{# context == receipt #}