Hi!
If you click and ship, this is what's automatically included:
Priority Mail International®
Parcels and Medium and Large Flat Rate Boxes
The Postal Service’s most economical international service gets your packages to over 190 countries and offers tracking, and includes indemnity coverage against loss, damage or missing contents as set forth in the International Mail Manual.
For a fee, the sender may purchase insurance for parcels containing certain merchandise to protect against loss, damage, or missing contents, which replaces the ordinary indemnity coverage.
Go online and order free packaging, pay postage and request Package Pickup™ at no extra charge. See International Mail Manual for additional details.
Flat Rate Envelopes and Small Flat Rate Boxes
Cost-effective service with priority handling for sending documents and packages up to four (4) pounds to over 190 countries. Total package value can be up to $400.00 USD.
Go online and order free packaging, pay postage and request Package Pickup at no extra charge.
Registered Mail™ service is available but insurance and tracking are not available with these Priority Mail International flat rate services. See International Mail Manual for additional details.
When shipping to Canada, Electronic Delivery Confirmation® International Service is included for Priority Mail International Flat Rate Envelopes and Small Flat Rate Boxes.
Available products (must use USPS supplied packaging):
Letter-size Flat Rate Envelope (12 ½ x 9 ½ inches)
Gift Card Flat Rate Envelope (10 x 7 inches)
Small Flat Rate Envelope (10 x 6 inches)
Legal-size Flat Rate Envelope (15 x 9-1/2 inches)
Padded Flat Rate Envelope (12-1/2 x 9-1/2 inches)
Small Flat Rate Box (5-3/8 x 8-5/8 x 1-5/8 inches when folded for use)
DVD Flat Rate priced Box (7-9/16 x 5-7/16 x 1-3/8 inches)
Large Video Flat Rate priced Box (7-9/16 x 5-7/16 x 1-3/8 inches)
These are the services you can add:
http://faq.usps.com/eCustomer/iq/usps/request.do?session={340e80c0-8b26-11e2-7785-000000000000}&event=1&view%28%29=c{1913b6a0-57e2-11dc-51b6-000000000000}&objectId=&eksObjectId=&objectType=Case&isJumpEnabled=false&isContentJumpEnabled=false&vendorKey=&objTitle=&versionId=10423&searchProperties=type:natural&naturalAdvance=false&allStr=&phraseStr=&anyStr=&noneStr=&keywordStr=&tTitle=&topicFromSub=&topicsORSubUrl=&report%280000%29=p{6d39af50-6975-11dd-e6c4-000000000000}&bcobjectId={ceff8d00-6974-11dd-e6c4-000000000000}&search=what%20services%20does%20priority%20international%20entail?&topicAndSubtopic=Receiving%20Mail$ALL
So it appears that delivery confirmation is included in the price of postage but you probably have to add signature confirmation.