Once all customers have been invoiced, they will receive an internal message. The process operates as follows: if a customer has provided an email address, they will receive an invoice via email about the 5th of the month. If no email address is available, you can print out an invoice and physically mail it to the customer.

In case a customer does not receive the invoice email, it is assumed that they are aware of the payment requirement. Alternatively, physical invoices can be sent to customers, necessitating manual updates to the payment status in the application for accurate tracking.

Moreover, our payment system offers customization options tailored to each customer's preferences. Some customers opt for monthly payments, while others prefer quarterly or annual payments. Additionally, some customers are seasonal, meaning they only pay for a specific period. When a customer submits a payment, they can adjust the payment amount to cover future months.

For instance, if there is a price increase in June and a customer already paid for the entire year in January, our system will automatically deduct the new amount to reflect the price change. However, the customer will need to add additional funds to cover the price difference. To ensure customers are informed in advance, we can utilize the "Content" button to notify them of the upcoming price hike. This way, customers will have ample time to add the necessary funds before their account balance is depleted. If the account gets depleted then they will be see an unpaid invoice as if they were a customer that pays month to month.