JOBot/JOBot.Backend/Services/gRPC/UserService.cs

using Grpc.Core;
using JOBot.Proto;

class UserService : User.UserBase
{
    public override Task<RegisterResponse> Register(
        RegisterRequest request,
        ServerCallContext context)

    {
        return Task.FromResult(new RegisterResponse
        {
            UserId = request.UserId
        });
    }
}