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Kendall BuchananKendall Buchanan 

Triggering Flows via REST API

Can't figure out how to trigger a flow via the REST API.

Spring '15 says it supports it: http://www.salesforce.com/us/developer/docs/api_rest/api_rest.pdf (page 110)

Here's a shorter introduction: https://developer.salesforce.com/docs/atlas.en-us.salesforce_vpm_guide.meta/salesforce_vpm_guide/vpm_distribute_system_rest.htm

Our sandbox environment has Spring '15 enabled. Any requests to /services/data/v33.0/actions/custom result in "The requested resource does not exist", POST or GETs.

Any advice?
ShashankShashank (Salesforce Developers) 
Please note that you can only invoke "autolaunched flows" through the REST API custom invocation actions. When a user saves a flow (with no Screen elements), the user is given the option to select the Type "Autolaunched Flow". Only these flows can be launched by the REST API. 
Kendall BuchananKendall Buchanan
Resolution: Turns out we'd had Spring '15 turned on, and then it was revoked. Simple as that.