The main purpose of the quadrennial Congress is to examine proposals to amend the Acts of the UPU , including the UPU Constitution , General Regulations , Convention and Postal Payment Services Agreement .
The Universal Postal Congress is the most important body of the UPU .
The main purpose of the quadrennial Congress is to examine proposals to amend the Acts of the UPU , including the UPU Constitution , General Regulations , Convention and Postal Payment Services Agreement .
The Universal Postal Congress is the most important body of the UPU .