Can my customers log in to see their old bookings and download their tickets again without having to email me?

Yes, a white label portal can give your customers their own login area where they see their upcoming and past trips and pull their own documents again, so you are not forwarding the same voucher every week. Usually the account is created when they book, or they can register first and their bookings get linked to them afterwards using their booking reference and the email they used.

What they can actually do in there varies. Viewing the trip details and downloading a ticket or voucher that has already been issued is the straightforward part. Anything that touches the supplier, like cancelling, changing a date or adding a bag, depends on whether that supplier allows self service at all, and many do not. In those cases the sensible setup is to let the customer send a request from their account that lands with you, and you handle it with the supplier yourself. Some portals also hide the document until the booking is fully confirmed, which is normal for hotels that need to come back to you.

It is also worth deciding what you do not want shown. Your cost and your markup should stay out of the customer view, and you may prefer not to show internal notes or supplier names there either. Whether the customer area is part of your current plan, and how much of it you can switch on or off, is something to confirm rather than assume.

The next step is to make a test booking on your own portal, log in as that customer, and check that the documents, the trip details and the request option all look the way you want your travellers to see them.