/// <summary>
        /// Create a new subscription. Can be for a new user, or a user who already has another subscription.
        /// It is important that you store either the SubscriptionAlias that you use to create this subscription,
        /// or the SubscriptionId that ProfitWell returns in the response, so that you can update/churn this subscription
        /// at a later date.IMPORTANT: If you are creating multiple subscriptions for the same user, it is important that
        /// you wait for a response from the API after creating the first subscription before creating subsequent subscriptions.
        /// </summary>
        public async Task <CreateSubscriptionResponseModel> CreateSubscriptionAsync(CreateSubscriptionRequestModel model)
        {
            try
            {
                string        json          = Newtonsoft.Json.JsonConvert.SerializeObject(model);
                StringContent stringContent = new StringContent(json, System.Text.Encoding.Default, "application/json");

                var result = await client.PostAsync("v2/subscriptions/", stringContent);

                var jsonResponse = await result.Content.ReadAsStringAsync();

                var response = Newtonsoft.Json.JsonConvert.DeserializeObject <CreateSubscriptionResponseModel>(jsonResponse);
                if (response == null)
                {
                    response = new CreateSubscriptionResponseModel();
                }
                response.IsSuccessfull = result.IsSuccessStatusCode;
                return(response);
            }
            catch (Exception e)
            {
                throw e;
            }
        }
 /// <summary>
 /// Create a new subscription. Can be for a new user, or a user who already has another subscription.
 /// It is important that you store either the SubscriptionAlias that you use to create this subscription,
 /// or the SubscriptionId that ProfitWell returns in the response, so that you can update/churn this subscription
 /// at a later date.IMPORTANT: If you are creating multiple subscriptions for the same user, it is important that
 /// you wait for a response from the API after creating the first subscription before creating subsequent subscriptions.
 /// </summary>
 public CreateSubscriptionResponseModel CreateSubscription(CreateSubscriptionRequestModel model) => CreateSubscriptionAsync(model).ConfigureAwait(false).GetAwaiter().GetResult();