# 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: . --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.vngcloud.vn/vng-cloud-document/billing-management/experience-with-billing-and-payment/payment/automatic-invoice-payment.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.