URI for actions of services I have defined the following service.

'salesforce_subscriptions' =&gt; array(
    'operations' =&gt; array(
      'delete' =&gt; array(
        'help' =&gt; 'Remove subscriptions from SalesForce',
        ...
        'args' =&gt; array(
          array(
            'name' =&gt; 'ids',
            'type' =&gt; 'string',
            'description' =&gt; '',
            'source' =&gt; array('param' =&gt; 'ids'),
            'optional' =&gt; FALSE,
          ),
          array(
            'name' =&gt; 'API key',
            'optional' =&gt; FALSE,
            'type' =&gt; 'string',
            'description' =&gt; 'The api key',
            'source' =&gt; array('param' =&gt; 'api_key'),
          ),
        )
      )
    ),


How can I access this? 
The endpoint of the service is: endpoint.
I can access the index service by:
www.example.com/endpoint/salesforce_subscriptions 

How can I access delete?
You should be able to access it via

www.example.com/endpoint/salesforce_subscriptions/[ids]/delete


If that doesn't work, you may need to experiment with the id parameter source, e.g path argument vs param

For more info and example, see the node resource definition here: 

_node_resource_definition