Airlines have different rules about the kinds of characters that can be included in passengers' names and how long these names can be.
Usually, they only allow basic ASCII characters, which can cause problems for passengers whose names include accents, and up to 20 characters in length.
We now check this on our side before sending your request to the airline, avoiding confusing error messages and a bad experience for your customers.
We'll only allow names with between 1 and 20 characters and a subset of letters and special characters. You can read more in our API documentation.