Question: Although the client - side validation checks the correct form of the booking reference, it does not actually check it is a valid booking reference.

Although the client-side validation checks the correct form of the booking reference, it does not actually check it is a valid booking reference.
For a reference to be valid, the server-side should validate the reference to the same format as the client-side, plus the following additional constraints: the three-letter group must be one of EGH,ONL,DSC. Anything else is invalid.

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