- Open the customer (Contacts → Customers) and click Edit.
- In Name and contact switch on Portal access. Emails this customer a link to set up their own login, where they can see their invoices, payments and statement. Turning it off revokes the login.
- Save. The customer receives an activation email. The customer record now shows the state — Invited, Active (with the last sign-in), Link expired or Revoked — and a Resend button that issues a fresh link and disables the previous one.
- To give an individual at the customer their own login as well, open the Contact persons section and switch on Own portal login for that person.