The access_token field in the get access token response contains a bearer token, indicated by the token_type of Bearer :
Response 200 (application/json)

  {
      "access_token": "eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ik0wWXpRa",
      "scope": "<scopes>",
      "expires_in": "5184000",
      "token_type": "Bearer"
  }
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