There was a limitation with virtual classroom API that used to show the launch URLs for students only at the specific date and time of the scheduled class. We have now introduced a new feature in the API giving you the ability to see the launch URLs in advance. Use "getclasslaunch" API call to get the launch URLs for instructor and all the students.The result is the ability to show this launch button in advance in addition to other database queries and workflow changes in your website.
Use developer API documentation to learn more about integrating Virtual Classroom with your website, CMS, or LMS.
See this KB note for frequently asked questions.
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