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https://www.usps.org/dues/dues_processa.php
DUES PAYMENT
Required Information:
Your certificate number
Your invoice number
http://www.usps.org/dues/donation_processa.php 
ENDOWMENT FUND
Required Information:
Your certificate number
Your Zip Code
   
http://www.usps.org/dues/donation_processa_ed.php
EDUCATIONAL FUND
Required Information:
Your certificate number
Your Zip Code
NON-MEMBER OPTION AVAILABLE

http://www.usps.org/dues/donation_processa_gf.php
GENERAL FUND
Required Information:
Your certificate number
Your Zip Code