> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ca.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](https://docs.ca.cryptoprocessing.com/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 **CryptoProcessing API** collection's variables and enter:

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

Use an active Master key to access the full collection, or an active Custom key when testing only the endpoints enabled for that key. Once these values are set, you can start sending requests.

> [!WARNING]
>
> The list of supported currencies in the sandbox environment is different from the list in the production environment.


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