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There are two types of Invoices in the system:
An outgoing Invoice is used to charge a Client entity for the services they used throughout an invoicing period.
An incoming Invoice is generally used to check whether you as a company are being charged correctly by your carrier/partner.
Outgoing Invoice for a Client will cover Transactions for their origination type calls/SMS/data with a positive rate and termination type calls/SMS/data with a negative one. While an Incoming Invoice will cover negative origination and positive termination for a specific Client.