Does my portal ask for passport details when my customer books an international flight?

Yes, a portal can collect passport details, but whether it actually asks for them on a given booking depends on the airline and on the fare your customer has chosen. Some airlines want the passport number, the country of issue and the expiry date at the moment the ticket is issued, and in those cases the booking cannot be completed until the fields are filled in. Others are happy to take just the name and date of birth, and they collect the passport later at check in.

When the details are asked for, they should be typed exactly as they appear on the passport, including the middle names if the airline asks for the full name. A detail that does not match the document can cause trouble at the airport, and correcting it after the ticket has been issued is not always simple or free, since that part is decided by the airline and not by your portal.

Please keep in mind that a portal cannot tell your customer whether they need a visa for the trip. Entry rules belong to the country being visited and they change often, so the traveller remains responsible for holding the right documents, whatever the booking screen accepted.

A sensible next step is to ask which of your suppliers require passport details at the time of booking, and to tell your staff to copy those details straight from the document rather than from memory.