Zoho Books Sandbox environment

Zoho Books Sandbox environment

Hello.
Is there a free sandbox environment for the developers using Zoho Books API?
I am working on the Zoho Books add-on and currently not ready to buy a premium service - maybe later when my add-on will start to bring money.
Right now I just need a sandbox to test my add-on, I do not need any real functionality.

I know that Salesforce has such sandbox environment, and, by the strange coincidence, there are tons of the Salesforce third-party apps :)

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