> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cryptoprocessing.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Postman API Testing

Postman is a widely used tool for developing and testing APIs. You can use the Postman collection below to test the CryptoProcessing API in the sandbox environment.

[Download the Postman collection](/api-reference/SandBox_API_Collection.postman_collection.json)

When you click the link, the JSON file opens in a new browser tab rather than downloading automatically. Save it to your computer, then import it into Postman.

After importing it, open the **SandBox API Collection** variables and enter:

* your API key in the `key-v2` field
* your secret key in the `secret-v2` field

Once these values are set, you can start sending requests.