Every deliverable must have an invoicing method. Once you have selected an invoicing method, you can create a calculation with activities and project-costs.adoc[costs]. You can also begin tracking time against the deliverable.
VOGSY supports the following invoice methods:
Fixed Price. This means the customer has agreed to pay a set price for the deliverable.
Time & Material. This means the customer has agreed to pay for the deliverable based on the resources used and/or the time expended.
Subscription. This means the customer has agreed to pay for your services over a period of time and to be invoiced at an agreed upon frequency.