AuthenticationController.cs

[HttpPost("login")]
        public IActionResult Login([FromBody]UserCredentials credentials)
        {
            var user = _context.Users.SingleOrDefault(u => u.Email == credentials.Email);

            if (user != null)
            {
                var hashedPassword = _hashingService.Hash(credentials.Password, user.Salt);

                if (hashedPassword == user.HashedPassword)
                {
                    return Ok(BuildToken(user.Email));
                }
            }

            return BadRequest("Could not login.");
        }