Gazzamit, thanks for the help and the tips.
83592127 is invoice id for reference in payment systems or receipts etc.
Not sure why there would need to be both an invoice ID (custom_id) generated for the invoice and a separate, hidden, random invoice ID (invoice_id) for payment reference. The customer and I are both using custom_id for payment reference. The payment gateway gets the custom_id, too, right?
