Waggoner Mercantile Agency, Inc. 220 N 7th St Saint Joseph, MO 64501-1906 Waggoner Mercantile Agency, Inc. Waggoner Mercantile Agency, Inc. is an Missouri collection agency. Missouri collection agencies can help businesses, medical practices and facilities that are creditors to collect their accounts receivable. Debt collection help might include; collection demand letters, … [Read more...]