In Azavista, you can choose to invoice your participants for your paid events. To do so, you first need to create a payment integration of type invoice if it doesn't already exist.
In order to do that, navigate to the Integrations module on the global level and click the Add button. Then select the "Payment" integration type, "Invoice" sub-type, give your integration an easily recognizable name and click Create.
In the next page, simply click Save because no configuration is necessary for this integration. Then activate the integration by turning on the activation switch.
Now that you have created the invoice integration, in order to add this integration to your event, navigate to your event and then to the Tickets and Products module. Go to the Payment Settings submodule, click Edit for the Payment Provider setting, and select your invoice integration from the dropdown menu. Then click Apply.