Install-Package Owin.Security.RedisTokenProviders

 OAuthOptions = new OAuthAuthorizationServerOptions
 {
    //Other configurations
    
    RefreshTokenProvider = new RedisRefreshTokenProvider(new ProviderConfiguration
    {
       Db = 0,
       ExpiresUtc = DateTime.UtcNow.AddYears(1),
       Port = 6379,
       Host = "localhost",
       AbortOnConnectFail =true //Optional (default:true)
    })
    {
       RedisKeyGenerator = (authenticationTicket, token) => token, // Optional
       RefreshTokenGenerator = () => Guid.NewGuid().ToString()         // Optional
    }
 };