In order to get an IPAA, you are required to complete and submit an International Passport Advantage Agreement Enrollment form (the enrollment can be online or through an authorized IBM Business Partner).
If your organization does not have an existing IBM Passport Advantage Agreement, you’ll need to use online enrollment to enter your data (please note that electronic submission is not enabled in all countries, so for some countries, the online enrollment requires some additional steps).
IBM is listing here what are the advantages you can get from enrolling in Passport Advantage.
When enrolling into an IPAA, you need to sign the enrollment form. Based on your region or country, the enrollment form requires either one signature, two signatures or no signature at all. The list of the signature requirements can be found here.
After enrolling into IPAA, you can order your IBM Licenses through an IBM Business Partner, an IBM sales office or online, via Passport Advantage (for existing customers).