# Invoices TEOS API consumers can create an invoice to get a digital record for agreed obligation of payment and pay invoice to fulfil this obligation. Invoice is a time-stamped digital record for a payment agreement made between two parties.\ An invoice defines the obligation of a sender to transfer a specified amount of an asset (in sparks) to a target address before the due date.\ Once created, the invoice remains in the Open status until it is either paid, expired, canceled, or fails. 📘 [Learn more](/resources/using-the-teos-api/concepts/invoice.md) about invoices. --- # 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://teos-docs.coreledger.net/guides/invoices.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.