Test Environment

Hi All,

Is there a way to setup a Developer Environment whereby we can use it for testing our App.

For example our App sends Sales Orders and Invoices to MYOB, we want to be able to test this data against a live environment albeit a test environment.

How do we sign up for such a thing (Dev Env)?
Or do we have to pay full price?

Or can we get it in trial mode for longer than 30days?

Thank you in advance for your time on this.