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Using CSI Support
Instructions
News
Remote Support
Submit a request
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Welcome to our Support!
CSI Helsinki Support Site
Invoicing and Payments
Advance Invoice
Advance Invoice
What is an Advance Invoice
Creating and Editing Advance Invoices
Registering and Cancelling Advance Payments
Adjusting Advance Payments to Invoices and Cancelling Adjustments
Refunding Advance Payments and Cancelling Advance Invoices