The key or identifier for the product or service billed (e.g., “key:rent”)
The content of the description that is going to be put on the bill
The amount charged for the one-time bill item
The currency code for the one-time bill item amount (e.g., “DKK”)
The amount of the one-time bill item amount (e.g., 100.00)
The quantity of items that is going to be put on the bill
The date in ISO 8601 format that one-time bill item is due
The accounting period for the one-time bill item, in the format “YYYY-MM-DD/YYYY-MM-DD”
The VAT details for the one-time bill item
The tax mode for the VAT (e.g., “Exempt”, “Exclusive”)
The tax rate for the VAT (e.g., 0.25)
