Placing a Test Order (Craft Commerce)
If you are using the example templates, the dummy gateway should be enough to submit an order. Are you displaying any error flash message from the payment controller?

&lt;div class="flash"&gt;{{ craft.session.getFlash('notice') }}&lt;/div&gt;
&lt;div class="flash"&gt;{{ craft.session.getFlash('error') }}&lt;/div&gt;


The dummy gateway also expects a credit card that ends in an even number in order return a success:

https://craftcommerce.com/docs/payment-gateways#dummy-gateway