Hello, 

🟢 1. Subscriptions (App / Abonnements)

How it works

• A product can be sold as a subscription service (e.g. SaaS license, monthly maintenance, gym membership).
• When a customer signs up, Odoo creates a Subscription contract.
• The contract automatically generates invoices at the chosen frequency (monthly, yearly, etc.).
• Customers can manage their subscription (pause, cancel, renew) through the customer portal.
• Works very well with payment providers like Stripe, Mollie, Adyen for automatic recurring payments.

🔵 2. Recurring Plans 

How it works

• New feature in Odoo 18 Sales.
• You can now add recurring lines directly in a quotation/sales order.
• Each line can be tied to a Recurring Plan (e.g. monthly, yearly).
• Once the quotation is confirmed, Odoo automatically generates recurring invoices from that sales order.
• You can combine one-time items and recurring services in the same quotation.

Example

• Quotation = "Software Installation (one-shot €1000)" + "Monthly Support (€200/month)".
• Once confirmed:
  • Odoo invoices the €1000 installation immediately.
  • Then starts generating €200 invoices every month, based on the recurring plan.