# Purchase Invoices

- [List Purchase Invoices](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/list-purchase-invoices.md)
- [Retrieve the HTML of the Invoice](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/retrieve-the-html-of-the-invoice.md)
- [Retrieve the PDF of the Invoice](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/retrieve-the-pdf-of-the-invoice.md)
- [Retrieve the XML of the Invoice](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/retrieve-the-xml-of-the-invoice.md)
- [Assign Tags to Invoice](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/assign-tags-to-invoice.md)
- [Retrieve Tag Information of the Invoice](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/retrieve-tag-information-of-the-invoice.md)
- [Retrieve Transaction History](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/retrieve-transaction-history.md)
- [Retrieve Details](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/retrieve-details.md)
- [Retrieves Taxes](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/retrieves-taxes.md)
- [List Invoice Attachments](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/list-invoice-attachments.md)
- [Retrieve Despatch Note Information](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/retrieve-despatch-note-information.md)
- [Retrieve Email Transaction History](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/retrieve-email-transaction-history.md)
- [Retrieve WhatsApp Transaction History](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/retrieve-whatsapp-transaction-history.md)
- [Retrieve SMS Transaction History](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/retrieve-sms-transaction-history.md)
- [Retrieve Email Activities](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/retrieve-email-activities.md)
- [Export Invoices in Bulk](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/export-invoices-in-bulk.md)
- [Assign New Status to Invoices](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/assign-new-status-to-invoices.md)
- [Send the Invoice via Email](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/send-the-invoice-via-email.md)
- [Send the Invoice via WhatsApp](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/send-the-invoice-via-whatsapp.md)
- [Send the Invoice via SMS](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/send-the-invoice-via-sms.md)
- [Verify the Invoice with GİB](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/verify-the-invoice-with-gib.md)
- [Retrieve Envelope Information with ETTN Number for the Invoice](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/retrieve-envelope-information-with-ettn-number-for-the-invoice.md)
- [Save as Draft](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/save-as-draft.md)
- [Respond to the Invoice](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/respond-to-the-invoice.md)
- [Retrieve Rejection Response of the Invoice](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/retrieve-rejection-response-of-the-invoice.md)
- [Save the Purchase Invoice as a Return Invoice](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/save-the-purchase-invoice-as-a-return-invoice.md)
- [Retrieve Status Information of the Purchase Invoice](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/retrieve-status-information-of-the-purchase-invoice.md)
- [Assign Custom Code to Invoice](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/assign-custom-code-to-invoice.md)


---

# 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://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices.md?ask=<question>
```

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.