DMM TOC > 100 Retail Letters, Cards, Flats, and Parcels > 120 Priority Mail|
1.1 Payment Method
Priority Mail postage may be paid with postage stamps (see 604.1.0), or meter stamps (see 604.4.0) affixed to each piece.
Priority Mail Forever Prepaid Flat Rate packaging must be purchased by credit card online at www.usps.com and bears a shipping label with affixed Forever Prepaid postage. Mailers adding extra services must take packages to a retail Post Office location for payment of the associated fees for each extra service added. USPS Tracking (electronic option) is included at no additional cost.