The integration connects your existing ERP or accounting software to your ASP’s Peppol Access Point. Your ERP does not need to be replaced. The connection method is typically a REST API (for modern ERPs like SAP, Oracle, or MS Dynamics), SFTP file transfer (for older systems or batch invoicing), or a native plugin (for Odoo, Zoho, or QuickBooks). Technical integration takes 1−2 weeks. The work that takes longer is data preparation — auditing your customer master, collecting buyer Peppol IDs, and configuring transaction type codes. Budget 3−5 weeks total for a comfortable implementation.