Procure to Pay Purchasing Methods Process a purchase order, non-purchase order invoice, Purchasing Card, or reimbursement. Available Contracts and Suppliers Approved suppliers deliver best value, meet University policy, and include Central Procurement support. Anchor Destination Named: policies Policies View the Penn State Central Procurement policies that align with procure-to-pay. Competitive Bidding Understand competitive bidding requirements, thresholds, and documentation for compliance. Tax Exemption and Credit Download a PDF certificate or credit letter to share with a supplier before a purchase.