# Automatic invoice payment Auto payment is a feature designed to support GreenNode users in paying their unpaid invoices. **Target users** * Prepaid and postpaid users having unpaid invoices. * The invoices to be paid have the status of "unpaid" or "partially paid". **Runtime:** Every day. **Source of money:** GreenNode wallet (Credit wallet) **Tasks** * Filter out users with outstanding bills to be paid. * Check if there is an available balance in the wallet: * If the available balance is greater than 0: Prioritize paying bills in order of older bills and bills with smaller amounts first. * If the available balance is less than or equal to 0: Cancel the task. **Results upon completion of the task** * Send an email to the user notifying them of the bill that has just been paid. * Generate transaction history on the user portal at: * Billing history: . * Credit history: . * Payment history: .