public async Task <IActionResult> Invite(int companyId, string responseUrl, [FromBody] CompanyInvitationRequest request)
        {
            if (await db.CompanyInvitations.AnyAsync(x => x.CompanyId == companyId && x.Email == request.Email))
            {
                return(this.BadRequest(nameof(CompanyInvitation.Email), "An invitation has already been sent to this email."));
            }
            var invitation = new CompanyInvitation();

            invitation.Token       = Guid.NewGuid();
            invitation.CompanyId   = companyId;
            invitation.Email       = request.Email;
            invitation.Status      = InvitationStatus.Pending;
            invitation.Permissions = string.Join(",", request.Permissions);
            db.Add(invitation);
            await db.SaveChangesAsync();

            var companyName = await db.Companies
                              .Where(x => x.CompanyId == companyId)
                              .Select(x => x.Name)
                              .SingleAsync();

            await emailingClient.SendAsync(new EmailRequest
            {
                Data = new Dictionary <string, string>
                {
                    ["CompanyName"] = companyName,
                    ["ResponseUrl"] = string.Format(WebUtility.UrlDecode(responseUrl), invitation.Token)
                },
                Subject     = "Company Invitation",
                TemplateKey = "CompanyInvitation",
                To          = request.Email
            });

            var responseUri = new Uri(string.Format(WebUtility.UrlDecode(responseUrl), invitation.Token));
            var user        = await usersClient.GetUserByEmailAsync(request.Email);

            if (user != null)
            {
                await notificationsClient.NotifyAsync(user.UserId, new NotifyRequest
                {
                    RedirectPath = responseUri.PathAndQuery,
                    Subject      = $"Company Invitation",
                    Body         = $"You have been invited to to join the company <strong>{companyName}</strong>."
                });
            }

            return(NoContent());
        }