A couple wishing to purchase their first residence signs an exclusive buyer agency agreement with a real estate licensee in January. The agreement specifies that the buyers will work exclusively with the licensee, who will receive a commission if the couple purchases any property within six months of signing the agreement. The buyer agent devotes a whole week to showing the couple properties. Later, the couple attends an open house and buys directly through the listing agent. What is the couple’s obligation to the exclusive buyer agent?