Abstract: This disclosure describes, generally, methods and systems for implementing a purchase order approval workflow engine and approval framework. The method includes receiving, at an approval engine of an application server from a purchaser, a purchase order, wherein the purchase order includes a plurality of line items, applying, by the approval engine, one or more rules associated with the purchase order, and transmitting the purchase order to one or more approvers. The method further includes receiving, from the one or more approvers, approval for each of the plurality of line items. The approval of each line item is completed independent from any other line item. Further, the method includes receiving, at the approval engine, an indication that each of the plurality of line items are approved, and transmitting, to a supplier, the purchase order.