---
title: Invoice management | Knowledge base
description: Learn how to use e-invoicing features and get started with your account.
---

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1. [Knowledge base](https://knowledge.qvalia.com/)
2. [Invoice management](https://knowledge.qvalia.com/invoice-management)

# Invoice management

 Learn how to use e-invoicing features and get started with your account.

- [Why does the invoice look different to my recipient?](https://knowledge.qvalia.com/invoice-looks-different)
- [My PDF invoice was interpreted incorrectly](https://knowledge.qvalia.com/pdf-interpreted-incorrectly)
- [How large can an invoice or attachment be?](https://knowledge.qvalia.com/invoice-size-limits)
- [My customer is changing e-invoicing operator: what do I need to do?](https://knowledge.qvalia.com/customer-changed-operator)
- [Why am I seeing duplicates?](https://knowledge.qvalia.com/duplicate-invoices)
- [I sent the invoice to the wrong recipient](https://knowledge.qvalia.com/sent-to-wrong-recipient)
- [How to send an invoice by email as a PDF](https://knowledge.qvalia.com/how-to-send-an-invoice-by-email-as-a-pdf)
- [How do I change the invoice dates on customer invoices?](https://knowledge.qvalia.com/how-do-i-change-the-invoice-dates-on-customer-invoices)
- [How to change the currency on a customer invoice](https://knowledge.qvalia.com/how-to-change-the-currency-on-a-customer-invoice)
- [How do I send a Peppol e-invoice to a customer?](https://knowledge.qvalia.com/how-to-send-a-peppol-e-invoice-to-a-customer)
- [How do I add a Peppol ID to my customer?](https://knowledge.qvalia.com/how-do-i-add-a-peppol-id-to-my-customer)
- [How to download a copy of an invoice](https://knowledge.qvalia.com/how-to-download-or-print-my-invoices)
- [Can I manage other e-invoice formats besides Peppol?](https://knowledge.qvalia.com/can-i-manage-other-e-invoice-formats-besides-peppol)
- [Is a Peppol ID required for the sender to distribute e-invoices?](https://knowledge.qvalia.com/is-a-peppol-id-required-for-the-sender-to-distribute-e-invoices)
- [How do I find my customer's Peppol ID?](https://knowledge.qvalia.com/how-do-i-find-my-customers-peppol-id)
- [What does it mean when an invoice is delivered?](https://knowledge.qvalia.com/how-do-i-know-my-invoice-has-been-delivered)
- [How do I change the invoice number?](https://knowledge.qvalia.com/how-do-i-change-the-invoice-number)
- [How do I handle invoices in Quarantine?](https://knowledge.qvalia.com/how-to-manage-invoices-in-quarantine)
- [How does the Quarantine feature function?](https://knowledge.qvalia.com/how-does-the-quarantine-feature-function)
- [Why are invoices placed in Quarantine?](https://knowledge.qvalia.com/why-are-invoices-placed-in-quarantine)
- [How to deactivate Quarantine](https://knowledge.qvalia.com/how-to-deactivate-quarantine)
- [I sent an incorrect invoice: correct or credit it?](https://knowledge.qvalia.com/how-do-i-resolve-an-incorrect-customer-invoice-0)
- [How do I send a credit note to my customer?](https://knowledge.qvalia.com/how-do-i-send-a-credit-note-to-my-customer)
- [Attachments to Peppol invoices](https://knowledge.qvalia.com/how-to-add-attachments-to-a-peppol-e-invoice)

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- [General](https://knowledge.qvalia.com/general#main-content)

    - [Peppol](https://knowledge.qvalia.com/general#peppol)
- [Partner](https://knowledge.qvalia.com/partner)
- [Logs and monitoring](https://knowledge.qvalia.com/logs-and-monitoring)
- [Integrations](https://knowledge.qvalia.com/integrations)
- [Invoice management](https://knowledge.qvalia.com/invoice-management)
- [Order management](https://knowledge.qvalia.com/order-management)
- [Data management](https://knowledge.qvalia.com/data-management)
- [Security and compliance](https://knowledge.qvalia.com/security-and-compliance)
- [Account](https://knowledge.qvalia.com/account)
- [Troubleshooting](https://knowledge.qvalia.com/troubleshooting)

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