https://docs.whmcs.com/9-1/tags/migrations/Recent content in migrations onHugo -- gohugo.iohttps://docs.whmcs.com/9-1/getting-started/migrate-data-to-whmcs/Mon, 01 Jan 0001 00:00:00 +0000https://docs.whmcs.com/9-1/getting-started/migrate-data-to-whmcs/Compares the ImportAssist addon, the Sync Accounts feature for cPanel, Plesk, and DirectAdmin servers, and manual entry as methods for migrating clients, hosting accounts, and domains into WHMCS from another billing system or CSV file.https://docs.whmcs.com/9-1/addon-modules/importassist/Mon, 01 Jan 0001 00:00:00 +0000https://docs.whmcs.com/9-1/addon-modules/importassist/Lists supported source applications (WHMCS, Blesta, ClientExec, HostBill) and importable data types for database imports, plus the required CSV field format (id, email, first_name, and similar) and steps for CSV file uploads and manual imports.https://docs.whmcs.com/9-1/billing-and-invoicing/invoicing-tutorials/regenerate-historical-invoices/Mon, 01 Jan 0001 00:00:00 +0000https://docs.whmcs.com/9-1/billing-and-invoicing/invoicing-tutorials/regenerate-historical-invoices/Covers regenerating a single invoice by advancing Next Due Date and clicking Generate Due Invoices, and the multi-step process for regenerating a full sequence of historical invoices after a migration, including recording payments and suppressing notification emails.