How do I create a post to my Opportunity feed via REST API

Question

How can I create post to an Opportunity's feed via the REST API?

Answer 1

You could use this endpoint url

/services/data/v36.0/sobjects/FeedItem

And use POST method and pass the body

{
"ParentId":  "0069000000K8YjL",
"Body" : "hello there",
"type" : "TextPost",
"Title" : "New Post"
}

Result

Answer 2

You can also use the Chatter REST API. (You'll need to use it if you want to include @mentions, which aren't supported when inserting FeedItem sObjects. Here's the example from the docs.)