You can extend a license subscription by invoking the RenewSubscriptionHttp method as follows:
http://yourserver.com/qlm/qlmservice.asmx/RenewSubscriptionHttp?is\_avkey=ABC-DEF-GHI\&is\_expduration=\&is_expdate=<yyyy-mm-dd>
You can set one and only one of the expiry arguments: is_expdate or is_expduration.
When setting the is_expdate argument, the expiry date is absolute. The new expiry date will be set to the date you specified regardless of the previous value.
When setting the is_expduration argument, the expiry date is incremental. The new expiry date will be set to the previous value plus the new duration.
Examples:
{% code overflow="wrap" %}
https://qlm3.net/qlmdemo/qlmLicenseServer/qlmservice.asmx
/RenewSubscriptionHttp?is_avkey=BDHD0-X0K00-G5AK6-I8W4J-1Q1AKMAHN&is_expduration=90
https://qlm3.net/qlmdemo/qlmLicenseServer/qlmservice.asmx
/RenewSubscriptionHttp?is_avkey=BDHD0-X0K00-G5AK6-I8W4J-1Q1AKMAHN&is_expdate=2014-12-31
{% endcode %}