Thank you for posting in the Zoom Developer Fourm – I am happy to help @hidemune ! It seems like you are trying to understand the steps to authorize the Meeting SDK. Is that correct? If so, you will need to create Zoom Marketplace SDK app and use the App credentials to generate a JWT to authorize the Meeting SDK. Here is our document on how to authorize the Zoom Meeting SDK :
We also have a helpful article on troubleshooting meeting SDK signatures, you can check it out here :
Additionally, here is our support documentation on starting a webinar via SDK:
Please let me know if this helps or if you have further questions.