LILLIAN SUWANRUMPHAA top contender for Thailand’s throne—and the $40 billion fortune attached—reached a deal with American Express to pay down tens of thousands of dollars in overdue credit card bills in March, not long after The Daily Beast exposed court proceedings over the debt last month.Legal documents filed in New York State in March reveal that Vacharaesorn Vivacharawongse, presumed heir to elderly and spectacularly wealthy King Maha Vajiralongkorn, agreed to pay down $94,767.88 in charge