1. Make sure Auto Generate Invoice option is On ("Setup>Setting>Affiliate Panel Setting>Auto Generate Invoices"). Chose frequency you need by clicking  "Affiliate Default Invoice Frequency". Use Minimum Invoice Threshold setting to determine the minimum amount of money after which invoice will be generated. If you chose Manually, invoice will not be generated automatically.

2. Make sure the "Invoice Frequency" option is chosen in Affiliate Detail ->Billing Preferences page.

3.Set Billing Day at Affiliate Billing> Batch Generate Invoice (near Create Invoice button). 4. According to frequency, invoice will be regerated on billing date once total payout is more than chosen Minimum Invoice Threshold level. If total payout is less than  Minimum Invoice Threshold level -invoice will not be generated automatically.