public async Task <IActionResult> Checkout([FromBody] IEnumerable <ProductDto> products)
        {
            var email = HttpContext.User.FindFirstValue(ClaimTypes.Email);
            var user  = await userManager.FindByEmailAsync(email);

            var session = stripeService.CreateSession(user, products);

            return(Ok(new { sessionId = session.Id }));
        }