The date that the invoice says the payment is due, in ISO date string, YYYY-MM-DD
totalAmountstring
number string
descriptionstring
paymentScheduledDatestring date
When the payment will be triggered, in ISO date string, YYYY-MM-DD. It should be far enough in advance so when the payment reaches the vendor, it is still before or on the paymentDueDate. Date is based on the payment processor's timezone, i.e. EST.