Refreshtoken not getting generated

[k_prathip]

I am using GenerateAccessToken operation in OAuthv2 policy and I am not getting the refresh token in the response. Kindly help if I am missing something,

{ "issued_at": "1472206456848", "application_name": "4fd477af-c45c-4d0a-97a6-064eb7e36296", "scope": "", "status": "approved", "api_product_list": "[OAuthTester]", "expires_in": "3599", "developer.email": "k.prathip@gmail.com", "token_type": "BearerToken", "client_id": "PJrIRf64eMjtQXPoU9WCwXpOEGnGjAqL", "access_token": "LpVzvYs7KNMS4jZ6QvbW6MDObK4d", "organization_name": "prathiptest", "refresh_token_expires_in": "0", "refresh_count": "0" }