The payment term starts to run from the day the invoice is emitted to be paid.

Customization per customer
In the Advanced section, you can enter the custom payment term negotiated with your customer.
Grace period
For invoices with dynamic products, Hyperline uses a grace period - defined by a number of days - to leave invoices open before being sent to payment. This period allows you to review the invoices before they are finalised. At the end of this period, invoices are automatically sent for payment. The default duration is 3 days, but this can be configured on the Settings → Invoicing page.Behavior during the period
During this period, newly ingested events for the invoice billing period are considered and invoices are regularly updated, so they have the latest accurate usage data. Invoices in grace period don’t have a unique number (not part of the sequential numbering), this number is generated when the invoice is finalized/ready to be paid.
When the invoice leaves the grace period and is ready to be paid, a webhook
invoice.ready
message is sent. You can check more details about webhooks in
the webhooks page.