[Postman] is an API Collaboration Platform. Please access https://www.postman.com/ to download and install the client locally? (There's also a web version so please visit their website to find out more details)

• Download the Collections ("git clone" is recommended) from https://github.com/bybit-exchange/QuickStartWithPostman (Taking FuturesAPIs/FuturesAPIs.postman_collection.json as an example going forward)
• Import the Collections into the Postman app.

• Download the environment JSON file. (We provide a testnet environment for your reference)
• Refer to below screenshot to import your environment

• Update api key and secret accordingly (If you mean to test in mainnet, update URL to https://api.bybit.com)