How to call Dialogflow Rest API with OAuth access token - google-cloud-platform

I have created project in google console
Enable the Dialogflow API
Created OAuth v2 credential
Using this credentials i called access token api to generate token
https://accounts.google.com/o/oauth2/v2/auth?
scope=https://www.googleapis.com/auth/dialogflow&
access_type=offline&
include_granted_scopes=true&
response_type=code&
state=state_parameter_passthrough_value&
redirect_uri=http://localhost&
client_id= **i placed client id here**
I received access token and passed it to Dialog flow API
https://dialogflow.googleapis.com/v2/projects/**PROJECT-ID**/agent/sessions/123456:detectIntent
Header
Content-Type : application/json; charset=utf-8
Authorization : Bearer **ACCESS_TOKEN**
Body
{
"query_input": {
"text": {
"text": "I know french",
"language_code": "en-US"
}
}
}
Still i am getting this error
"error":{"code": 401, "message": "Request had invalid authentication credentials. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.",…}
i am not able to identify where i went wrong
Please help thanks in advance

The code that i was passing in api was the OAuth Code(Thanks John Hanley)
API to generate Access token from OAuth Code
Post : https://oauth2.googleapis.com/token
Content-Type: application/x-www-form-urlencoded
{
"code":"OAuth Code",
"client_id":"Client ID",
"client_secret":"Client Secret",
"redirect_uri":"http://localhost",
"grant_type":"authorization_code"
}
In response you receive this
Response
{
"access_token": "Token",
"expires_in": 3599,
"refresh_token": "Refresh Token",
"scope": "https://www.googleapis.com/auth/dialogflow",
"token_type": "Bearer"
}
Pass this access token in header of google API

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https://i.stack.imgur.com/Cgi7I.png
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