In the case where the customer has requested to change service after they have been invoiced, please follow these steps -
If the invoice is already paid, you will need to start by moving the payment to account credit, which will make the invoice editable.
Example: Customer is on a 1x Weekly pickup and has requested to switch to a 2x Weekly pickup. It is the middle of the month and the customer has already been invoiced for the current cycle.
Step 1: End the existing service.
Step 2: Add New Service
Step 3: Regenerate Invoice
If the customer had previously paid for the invoice, you can use the account credit towards the invoice and request the difference in payment
