Good questions, happy to clarify.
It appears Sandbox is not yet available?
Correct, we don’t currently offer sandbox/developer environments. We hope to support this in the future.
Can you please confirm that transcripts can only be available to be retrieved via API on Business accounts because Pro Accounts do not provide transcripts to Zoom users?
Correct—for transcription, you’ll need a Business, Education, or Enterprise license with cloud recording enabled
Do we need to have a Business Account in order to test features available on a Business Account only? We currently have a Pro account.
Yes. In order to test functionality (such as transcription), you’ll need at least 1 Business license. You might consider purchasing 1 monthly license to start—and if it doesn’t suit your needs, you can cancel.
If we make use of the Recording Completed Webhook, will this event be received by the OAuth user who participated in the meeting but who is not the host?
The webhook event will be triggered once the meeting recording completes, and will be sent to the endpoint designated under your OAuth app. A participant in the meeting will not receive the event. If you’re using OAuth, they would authorize your app, and if your app is subscribed to the Recording Completed webhook, you would receive this event when triggered by their meetings.
Let me know if this helps to clarify!