Wedding vows will be exchanged by Donna Marie Lueckenbach, an advertising executive with the Morning Call newspaper in Allentown, Pa., and Paul R. Shaffner, assistant football coach at Lafayette College, at 4 p.m. today in St. Andrew's Lutheran Church, Easton, Pa. The Rev. Richard Sauer will perform the ceremony for the daughter of Mr. and Mrs. John F. Lueckenbach of York, Pa., and the son of Mr. and Mrs. Robert L. Shaffner of Lancaster. A reception will be given in Holiday Inn, Bethlehem, Pa., before the couple travel to Jamaica. They will live in Easton. The bride is a graduate of Dickinson College. The bridegroom is a graduate of Lancaster Central High School and Ithaca College where he earned a master's degree.