Automatic Payment and Non-Billed Budgets
If a customer wants to pay their non-billed budget scheduled payments automatically, the account must be set up for automatic payment. In addition, the Non-Billed Budget must indicate that automatic payment is being used.
Fastpath: 
Refer to How To Set Up Automatic Payment For A Non-Billed Budget for more information.
When this is done, a background process referred to as NBBAPAY creates automatic payments on the scheduled payment date by calling the automatic payment creation algorithm plugged in on the installation record.
Note: 
You must ensure that your auto pay creation algorithm supports Non-Billed Budget scheduled payments. The APAY-CREATE algorithm type supplied with the base package supports non-billed budget scheduled payments.