> For the complete documentation index, see [llms.txt](https://docs.vngcloud.vn/vng-cloud-document/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.vngcloud.vn/vng-cloud-document/billing-management/experience-with-billing-and-payment/payment/automatic-invoice-payment.md). # 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 This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## 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, and the optional `goal` query parameter: ``` GET https://docs.vngcloud.vn/vng-cloud-document/billing-management/experience-with-billing-and-payment/payment/automatic-invoice-payment.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. 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.