To use an audio file hosted on the web, you have to use the Async Audio URL API. Click Send and in 30 or so seconds, you’ll receive the conversationId. Then click on “ Select File “ and choose the file “ business_meeting.mp3” or whatever file you wish to use. If you see any file pre-selected, please close it.
Once the audio file downloads, click on “ Headers” and change the value of “Content-Type” to “ audio/mpeg“. However, feel free to choose any mono-channel – mp3 or wav file you have (if you have another audio format, learn how to convert it using here). This file business_meeting.mp3 is provided for easy testing. Please click here to download an audio file if you don’t have one handy. Inside your Postman app, click on “ Async APIs” and then click on “ Audio – Submit New Audio(mp3/wav)“. After processing it, it gives you a Conversation ID as a unique ID for your audio file and a Job ID for tracking the audio processing job. This API takes your audio file and processes it. To upload your audio file, you have to use the Async Audio API. This token is automatically copied to all other APIs in Postman. Paste your credentials, click Send, and you should see accessToken (like in the image below). Using these you can generate a unique Token, which acts as a unique username/password for authentication. 
Inside the “ Body” tab, you’ll see appID and appSecret which are your credentials. Click on “Generate Token(Authenticate)” option and you’ll be able to see the API.
You should see an “ Authentication folder” on the left. After you have clicked on the Postman link provided above.You can find them on the home page of the platform. Your credentials consist of your appId and appSecret. Before we can begin processing your file, you will need to retrieve your credentials.
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