shopify straight to checkout/stay on page.

redirects-shopify.html

{% assign send_to_cart = true %}
{% assign send_to_checkout = false %}

{% for tag in product.tags %}
  {% if tag contains "no__redirect" %}
  {% assign send_to_cart = false %}
  {% endif %}
  {% if tag contains "send_to_checkout" %}
  {% assign send_to_checkout = true %}		
  {% endif %}
{% endfor %}




{% if send_to_cart == false %}
<input type="hidden" name="return_to" value="back" />
{% endif %}

{% if send_to_checkout == true %}
<input type="hidden" name="return_to" value="/checkout" />
{% endif %}