/// <summary>
/// Create and new refresh token
/// </summary>
/// <param name="subject"></param>
/// <returns></returns>
private async Task <(String refreshTokenId, DateTime refreshTokenExpiresUtc)> CreateRefreshTokenAsync(JwtSecurityToken token)
{
var refreshToken = new RefreshTokenModel(
subject: token.Subject,
issuedUtc: DateTime.UtcNow,
expiresIn: _refreshTokenLifetime,
accessToken: new JwtSecurityTokenHandler().WriteToken(token));
var refreshTokenId = await _refreshTokenRepository.SaveRefreshTokenAsync(refreshToken);
return(refreshTokenId, refreshToken.ExpiresUtc);
}