Force.com Actions Developer's Guide
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Invoking Actions
All actions are invoked using the same JSON body format. The following example shows two Chatter posts made with a single Post to Chatter action.
1{ "inputs" :
2 [
3 {
4 "subjectNameOrId" : "jsmith@salesforce.com",
5 "type" : "user",
6 "text" : "first chatter post!"
7 },
8 {
9 "subjectNameOrId" : "hsmith@salesforce.com",
10 "type" : "user",
11 "text" : "second chatter post!"
12 }
13 ]
14}