To begin, create an account in the sandbox environment. Your sandbox account will be in no way connected to your live account, and can be used safely without worry of affecting your production account.
Verify your account
To complete the registration process, you will need to verify your email address and phone number. When verifying your phone number in the sandbox environment, use the verification code "0000000" when prompted to do so. No SMS will be sent to your phone.
Fund your account
You can add funds to your sandbox account using any bitcoin testnet "faucet," which dispenses "fake bitcoin" to assist in development. We recommend using one of these following:
Connect your application
To connect your application, login to the sandbox environment. In the top right hand corner you will see a profile icon. That is where you will find the drop down menu where you can select ‘applications’. You will be taken to a page where you can register a new application and obtain a ClientID and ClientSecret.