Marlin GTX enables payments and other transactions to be recorded using invoices.
Invoices are used to finalise work orders, record standalone sales and process reversals, ensuring stock movements, payments and audit history are retained.
They can be added directly from existing orders or entered manually using the Invoices module.
Invoicing Orders
Orders are typically invoiced from within a Work Order.

To invoice an order:
- Open the relevant work order
- Click Invoice at the top of the window
- Click Yes if prompted to save changes
The Invoice window will open.

Review the invoice details and edit if required.
Finalising Invoices
Invoices can be finalised from either a work order or the Invoices module.

To finalise an invoice:
- Click Finalise at the top of the invoice window
The next step depends on the customer type.
Cash Customers
For cash customers, the Payment Details window will open.

To record payment:
- Enter the payment amount against one or more transaction types:
- Press Enter on the keyboard to enter the full amount
- Key in different amounts for split payments
- Click Ok
Account Customers
For account customers, the Finalise Invoice Details window will open.

To finalise the invoice:
- Confirm the payment terms
- Click Finalise
To take immediate payment instead, click Pay Now.
Cash customers and account customers are covered in more detail in later onboarding guides.
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Delivering Invoices
After finalising, the Document Delivery window will open.

Choose how to deliver the invoice:
- Print the invoice
- Or, Send it electronically
- Or, click Skip to continue without delivery
Invoices Module
Standalone invoices can be created using the Invoices module, whihc can be accessed by selecting Main > Data Entry > Invoices from the menu bar.

Invoices added here can be finalised using the same process as work order invoices.
Standalone invoices may reduce traceability and stock control.
Use work orders for managed workshop transactions.
Reversing Invoices
Invoices can be reversed using credit notes, which are are covered in the following onboarding guide.
See the Invoices help guide.