Artikel 15

1. The charges for the various postal services defined in the Convention shall be set by the member countries or their designated operators, depending on national legislation, in accordance with the principles set out in the Convention and its Regulations. They shall in principle be related to the costs of providing these services.
2. The member country of origin or its designated operator, depending on national legislation, shall fix the postage charges for the conveyance of letter- and parcel-post items. The postage charges shall cover delivery of the items to the place of address provided that this delivery service is operated in the country of destination for the items in question.
3. The charges collected, including those laid down for guideline purposes in the Acts, shall be at least equal to those collected on internal service items presenting the same characteristics (category, quantity, handling time, etc.).
4. Member countries or their designated operators, depending on national legislation, shall be authorized to exceed any guideline charges appearing in the Acts.
5. Above the minimum level of charges laid down in 3, member countries or their designated operators may allow reduced charges based on their national legislation for letter-post items and parcels posted in the territory of the member country. They may, for instance, give preferential rates to major users of the Post.
6. No postal charge of any kind may be collected from customers other than those provided for in the Acts.
7. Except where otherwise provided in the Acts, each designated operator shall retain the charges which it has collected.