Set up the data collection to be paginated

template.liquid

{% paginate collection.products by 3 %}
<!-- Start the pagination and tells Ajaxify how many items to load at once -->

  <div class="EndlessScroll">
  <!-- Ajaxify will insert the items in this element -->

    {% for product in collection.products %}
      {% include 'product-grid-item' %}
    {% endfor %}
    <!-- Regular data collection loop -->

    {% if paginate.next %}
      <div class="pagination">
        <a href="{{ paginate.next.url }}">Loading More</a>
      </div>
    {% endif %}
    <!-- Tells Ajaxify what to show when a new page is available --> 
    <!-- Modifying this part is optional, it works fine out of the box -->

  </div>

{% endpaginate %}