Changes to Book

the request's body type changed from object to no type

added subschema #7: NOT_ENOUGH_BALANCE to the response body oneOf list for the response status 400

removed the request property contact_data

removed the request property external_booking_reference

removed the request property loyalty_data

removed the request property modality

removed the request property payment

removed the request property prebook_id

removed the request property travelers

added subschema #1: ONE_CARD subschema #2: CURRENT_ACCOUNT to the request body oneOf list