A flexible spending account system can be implemented according to one embodiment of the invention so as to automatically substantiate purchases made at a retailer merchant. For example, according to one embodiment of the invention, a method of authorizing products for purchase can be implemented by determining via a computer that a product requested for purchase at a point of sale by a consumer matches a qualified product category under the flexible spending account, sending an authorization request message for requesting use of said flexible spending account of said consumer, wherein said authorization request message comprises a total purchase amount field and a first qualified amount field for a first type of qualified items.